Kein Wert für einen oder mehrere erforderliche Parameter angegeben. System.Data.OleDb.OleDbException:

-1

Ich bekomme diesen Fehler beim Ausführen meiner aspx-Datei, wenn ich auf Button2 nach Auswahl Start-und Enddatum und Wert aus der Dropdown-Liste klicken. Die Website funktionierte normal, aber jetzt gibt es diese Ausnahme. Mein Aspx-Code ist wie folgtKein Wert für einen oder mehrere erforderliche Parameter angegeben. System.Data.OleDb.OleDbException:

<center><p style="color: #000000; font-weight: bold;"> 
      START DATE AND TIME&nbsp;&nbsp;&nbsp; <asp:TextBox ID="TextBox3" runat="server" Width="181px" BorderColor="Black" BorderStyle="Solid"></asp:TextBox>&nbsp;<img src="calender.png" /></p></center> 
     <center> <p style="color: #000000; font-weight: bold;"> 
      END DATE&nbsp;AND TIME&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <asp:TextBox ID="TextBox2" runat="server" Width="188px" BorderColor="Black" BorderStyle="Solid"></asp:TextBox>&nbsp;<img src="calender.png" /> 
     </p> 
     </center> 

      <br /> 
      &nbsp;&nbsp;&nbsp;&nbsp; 
      <center style="height: 40px"> <asp:Button ID="Button2" runat="server" Text="SUBMIT AND CALCULATE" onclick="btnSave_Click1" BackColor="#FF9966" CssClass="btn btn-large" Font-Bold="True"/> 
       <br />

 <td> 
    <asp:GridView ID="GridView4" runat="server" AutoGenerateColumns="False" CellPadding="3" DataSourceID="SqlDataSource5" Height="146px" Width="53px" BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px" CellSpacing="2"> 
     <Columns> 
      <asp:BoundField DataField="stdev_POLQA_score" HeaderText="stdev_POLQA_score" ReadOnly="True" SortExpression="stdev_POLQA_score" > 
      <ItemStyle Font-Bold="True" /> 
      </asp:BoundField> 
     </Columns> 
     <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" /> 
     <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" /> 
     <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" /> 
     <RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" /> 
     <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" /> 
     <SortedAscendingCellStyle BackColor="#FFF1D4" /> 
     <SortedAscendingHeaderStyle BackColor="#B95C30" /> 
     <SortedDescendingCellStyle BackColor="#F1E5CE" /> 
     <SortedDescendingHeaderStyle BackColor="#93451F" /> 
    </asp:GridView></td></tr></table> 

     <br /> 
     <asp:Button ID="Button4" runat="server" BackColor="#FF9966" Text="EXPORT POLQA TO EXCEL" CssClass="btn btn-large" Font-Bold="True" /> 
     <br /> 

    <br /> 
    <table><tr> <td> 
    <asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" CellPadding="4" DataSourceID="SqlDataSource3" Height="146px" Width="53px" ForeColor="Black" GridLines="Horizontal"> 
     <Columns> 
      <asp:BoundField DataField="mean_RTD" HeaderText="mean_RTD" ReadOnly="True" SortExpression="mean_RTD" > 
      <ItemStyle Font-Bold="True" /> 
      </asp:BoundField> 
     </Columns> 
     <FooterStyle BackColor="#CCCC99" ForeColor="Black" /> 
     <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White" /> 
     <PagerStyle ForeColor="Black" HorizontalAlign="Right" BackColor="White" /> 
     <SelectedRowStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" /> 
     <SortedAscendingCellStyle BackColor="#F7F7F7" /> 
     <SortedAscendingHeaderStyle BackColor="#4B4B4B" /> 
     <SortedDescendingCellStyle BackColor="#E5E5E5" /> 
     <SortedDescendingHeaderStyle BackColor="#242121" /> 
    </asp:GridView></td> 

    <br /><td> 
    <asp:GridView ID="GridView3" runat="server" AutoGenerateColumns="False" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" CellPadding="4" DataSourceID="SqlDataSource4" Height="146px" Width="53px" ForeColor="Black" GridLines="Horizontal"> 
     <Columns> 
      <asp:BoundField DataField="STDEV_RTD" HeaderText="stdev_RTD" ReadOnly="True" SortExpression="STDEV_RTD" > 
      <ItemStyle Font-Bold="True" /> 
      </asp:BoundField> 
     </Columns> 
     <FooterStyle BackColor="#CCCC99" ForeColor="Black" /> 
     <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White" /> 
     <PagerStyle ForeColor="Black" HorizontalAlign="Right" BackColor="White" /> 
     <SelectedRowStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" /> 
     <SortedAscendingCellStyle BackColor="#F7F7F7" /> 
     <SortedAscendingHeaderStyle BackColor="#4B4B4B" /> 
     <SortedDescendingCellStyle BackColor="#E5E5E5" /> 
     <SortedDescendingHeaderStyle BackColor="#242121" /> 
    </asp:GridView></td> 

    <br /> 

      </tr> </table> 
      </center> 
    <br /> 


    <center> <asp:Button ID="Button3" runat="server" Text="EXPORT RTD TO EXCEL" onclick="Button3_Click" BackColor="#FF9966" CssClass="btn btn-large" Font-Bold="True" Width="257px"/> 
    </center> 
    <br /> 

    <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:VQTConnectionString %>" ProviderName="<%$ ConnectionStrings:VQTConnectionString.ProviderName %>" SelectCommand="SELECT ROUND(AVG(POLQA_Score),3) AS mean_POLQA_score FROM VQTPOLQA WHERE VQT_Timestamp BETWEEN ? AND ? AND VQuad_PhoneID =?"> 
     <SelectParameters> 
      <asp:ControlParameter ControlID="TextBox3" DefaultValue="" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="TextBox2" DefaultValue="" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="DropDownList1" Name="?" PropertyName="SelectedValue" /> 
     </SelectParameters> 
    </asp:SqlDataSource> 

    <br /> 

    <asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:VQTConnectionString %>" ProviderName="<%$ ConnectionStrings:VQTConnectionString.ProviderName %>" SelectCommand="SELECT ROUND(AVG(RTD),3) AS mean_RTD FROM VQuadData WHERE VQuad_Timestamp BETWEEN ? AND ? AND RTD&gt;0 AND VQuad_PhoneID=?"> 
     <SelectParameters> 
      <asp:ControlParameter ControlID="TextBox3" DefaultValue="" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="TextBox2" DefaultValue="" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="DropDownList1" Name="?" PropertyName="SelectedValue" /> 
     </SelectParameters> 
    </asp:SqlDataSource> 

    <br /> 
    <asp:SqlDataSource ID="SqlDataSource6" runat="server" ConnectionString="<%$ ConnectionStrings:VQTConnectionString %>" ProviderName="<%$ ConnectionStrings:VQTConnectionString.ProviderName %>" SelectCommand="SELECT * FROM VQTPOLQA WHERE VQT_Timestamp BETWEEN ? AND ? AND VQuadPhone_ID=?"> 
     <SelectParameters> 
      <asp:ControlParameter ControlID="TextBox3" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="TextBox2" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="DropDownList1" Name="?" PropertyName="SelectedValue" /> 
     </SelectParameters> 
    </asp:SqlDataSource> 
    <br /> 

    <asp:SqlDataSource ID="SqlDataSource4" runat="server" ConnectionString="<%$ ConnectionStrings:VQTConnectionString %>" ProviderName="<%$ ConnectionStrings:VQTConnectionString.ProviderName %>" SelectCommand="SELECT ROUND(Stdev(RTD),3) AS STDEV_RTD FROM VQuadData WHERE VQuad_Timestamp BETWEEN ? AND? AND RTD&gt;0 AND VQuad_PhoneID=?"> 
     <SelectParameters> 
      <asp:ControlParameter ControlID="TextBox3" DefaultValue="" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="TextBox2" DefaultValue="" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="DropDownList1" Name="?" PropertyName="SelectedValue" /> 
     </SelectParameters> 
    </asp:SqlDataSource> 

    <asp:SqlDataSource ID="SqlDataSource7" runat="server" ConnectionString="<%$ ConnectionStrings:VQTConnectionString %>" ProviderName="<%$ ConnectionStrings:VQTConnectionString.ProviderName %>" SelectCommand="SELECT * FROM VQuadData WHERE VQuad_Timestamp BETWEEN ? AND ? AND VQuad_PhoneID=?"> 
     <SelectParameters> 
      <asp:ControlParameter ControlID="TextBox3" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="TextBox2" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="DropDownList1" Name="?" PropertyName="SelectedValue" /> 
     </SelectParameters> 
    </asp:SqlDataSource> 

    <br /> 
    <br /> 

    <asp:SqlDataSource ID="SqlDataSource5" runat="server" ConnectionString="<%$ ConnectionStrings:VQTConnectionString %>" ProviderName="<%$ ConnectionStrings:VQTConnectionString.ProviderName %>" SelectCommand="SELECT ROUND(Stdev(POLQA_score),3) AS stdev_POLQA_score FROM VQTPOLQA WHERE VQT_Timestamp BETWEEN ? AND ? AND VQuad_PhoneID=?"> 
     <SelectParameters> 
      <asp:ControlParameter ControlID="TextBox3" DefaultValue="" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="TextBox2" DefaultValue="" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="DropDownList1" Name="?" PropertyName="SelectedValue" /> 
     </SelectParameters> 
    </asp:SqlDataSource> 

    <br /> 
    <br /> 

    <div style="display:none" ><center> <asp:GridView ID="GridView5" runat="server" AutoGenerateColumns="False" DataKeyNames="ID" DataSourceID="SqlDataSource6" BackColor="White" BorderColor="#999999" BorderStyle="None" BorderWidth="1px" CellPadding="3" GridLines="Vertical"> 
     <AlternatingRowStyle BackColor="#DCDCDC" /> 
     <Columns> 
      <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" /> 
      <asp:BoundField DataField="VQT_Timestamp" HeaderText="VQT_Timestamp" SortExpression="VQT_Timestamp" /> 
      <asp:BoundField DataField="VQuad_Timestamp" HeaderText="VQuad_Timestamp" SortExpression="VQuad_Timestamp" /> 
      <asp:BoundField DataField="GPS_Position" HeaderText="GPS_Position" SortExpression="GPS_Position" /> 
      <asp:BoundField DataField="GPS_Lat" HeaderText="GPS_Lat" SortExpression="GPS_Lat" /> 
      <asp:BoundField DataField="GPS_Long" HeaderText="GPS_Long" SortExpression="GPS_Long" /> 
      <asp:BoundField DataField="VQuad_CallID" HeaderText="VQuad_CallID" SortExpression="VQuad_CallID" /> 
      <asp:BoundField DataField="VQuad_Location" HeaderText="VQuad_Location" SortExpression="VQuad_Location" /> 
      <asp:BoundField DataField="VQuad_PhoneID" HeaderText="VQuad_PhoneID" SortExpression="VQuad_PhoneID" /> 
      <asp:BoundField DataField="Degraded" HeaderText="Degraded" SortExpression="Degraded" /> 
      <asp:BoundField DataField="Deg_File_Name" HeaderText="Deg_File_Name" SortExpression="Deg_File_Name" /> 
      <asp:BoundField DataField="POLQA_Score" HeaderText="POLQA_Score" SortExpression="POLQA_Score" /> 
      <asp:BoundField DataField="Pass_Or_Fail" HeaderText="Pass_Or_Fail" SortExpression="Pass_Or_Fail" /> 
      <asp:BoundField DataField="Jitter_Min" HeaderText="Jitter_Min" SortExpression="Jitter_Min" /> 
      <asp:BoundField DataField="Jitter_Max" HeaderText="Jitter_Max" SortExpression="Jitter_Max" /> 
      <asp:BoundField DataField="Jitter_Ave" HeaderText="Jitter_Ave" SortExpression="Jitter_Ave" /> 
      <asp:BoundField DataField="EModel_Polqa" HeaderText="EModel_Polqa" SortExpression="EModel_Polqa" /> 
      <asp:BoundField DataField="Speech_Level_Diff" HeaderText="Speech_Level_Diff" SortExpression="Speech_Level_Diff" /> 
      <asp:BoundField DataField="SNR_Diff" HeaderText="SNR_Diff" SortExpression="SNR_Diff" /> 
      <asp:BoundField DataField="ASR_Ref" HeaderText="ASR_Ref" SortExpression="ASR_Ref" /> 
      <asp:BoundField DataField="ASR_Deg" HeaderText="ASR_Deg" SortExpression="ASR_Deg" /> 
      <asp:BoundField DataField="Number_of_Utterance" HeaderText="Number_of_Utterance" SortExpression="Number_of_Utterance" /> 
      <asp:BoundField DataField="Call_Timestamp" HeaderText="Call_Timestamp" SortExpression="Call_Timestamp" /> 
      <asp:BoundField DataField="CallType_Orig" HeaderText="CallType_Orig" SortExpression="CallType_Orig" /> 
      <asp:BoundField DataField="CallType_Term" HeaderText="CallType_Term" SortExpression="CallType_Term" /> 
     </Columns> 
     <FooterStyle BackColor="#CCCCCC" ForeColor="Black" /> 
     <HeaderStyle BackColor="#000084" Font-Bold="True" ForeColor="White" /> 
     <PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" /> 
     <RowStyle BackColor="#EEEEEE" ForeColor="Black" /> 
     <SelectedRowStyle BackColor="#008A8C" Font-Bold="True" ForeColor="White" /> 
     <SortedAscendingCellStyle BackColor="#F1F1F1" /> 
     <SortedAscendingHeaderStyle BackColor="#0000A9" /> 
     <SortedDescendingCellStyle BackColor="#CAC9C9" /> 
     <SortedDescendingHeaderStyle BackColor="#000065" /> 
    </asp:GridView></center></div> 

    <br /> 

    <div style="display:none"><center><asp:GridView ID="GridView6" runat="server" AutoGenerateColumns="False" DataKeyNames="ID" DataSourceID="SqlDataSource7"> 
     <Columns> 
      <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" /> 
      <asp:BoundField DataField="VQuad_Timestamp" HeaderText="VQuad_Timestamp" SortExpression="VQuad_Timestamp" /> 
      <asp:BoundField DataField="GPS_Position" HeaderText="GPS_Position" SortExpression="GPS_Position" /> 
      <asp:BoundField DataField="GPS_Lat" HeaderText="GPS_Lat" SortExpression="GPS_Lat" /> 
      <asp:BoundField DataField="GPS_Long" HeaderText="GPS_Long" SortExpression="GPS_Long" /> 
      <asp:BoundField DataField="AFT" HeaderText="AFT" SortExpression="AFT" /> 
      <asp:BoundField DataField="RTD" HeaderText="RTD" SortExpression="RTD" /> 
      <asp:BoundField DataField="RTD_Error" HeaderText="RTD_Error" SortExpression="RTD_Error" /> 
      <asp:BoundField DataField="PDD" HeaderText="PDD" SortExpression="PDD" /> 
      <asp:BoundField DataField="PDD_Error" HeaderText="PDD_Error" SortExpression="PDD_Error" /> 
      <asp:BoundField DataField="Phone_ID" HeaderText="Phone_ID" SortExpression="Phone_ID" /> 
      <asp:BoundField DataField="Call_Control_Event" HeaderText="Call_Control_Event" SortExpression="Call_Control_Event" /> 
      <asp:BoundField DataField="VQuad_CallID" HeaderText="VQuad_CallID" SortExpression="VQuad_CallID" /> 
      <asp:BoundField DataField="VQuad_Location" HeaderText="VQuad_Location" SortExpression="VQuad_Location" /> 
      <asp:BoundField DataField="VQuad_PhoneID" HeaderText="VQuad_PhoneID" SortExpression="VQuad_PhoneID" /> 
      <asp:BoundField DataField="Call_Timestamp" HeaderText="Call_Timestamp" SortExpression="Call_Timestamp" /> 
      <asp:BoundField DataField="RTD_Rating" HeaderText="RTD_Rating" SortExpression="RTD_Rating" /> 
      <asp:BoundField DataField="OWD" HeaderText="OWD" SortExpression="OWD" /> 
      <asp:BoundField DataField="SWR" HeaderText="SWR" SortExpression="SWR" /> 
      <asp:BoundField DataField="CC_Condition" HeaderText="CC_Condition" SortExpression="CC_Condition" /> 
      <asp:BoundField DataField="CallType_Orig" HeaderText="CallType_Orig" SortExpression="CallType_Orig" /> 
      <asp:BoundField DataField="CallType_Term" HeaderText="CallType_Term" SortExpression="CallType_Term" /> 
     </Columns> 
    </asp:GridView></center></div> 

    <br /> 
    <br /> 

    <asp:AccessDataSource runat="server" DataFile="C:\Users\saishnib\Desktop\VQT DB LATEST ORIGINAL (copy)\New folder\VQT.mdb" SelectCommand="SELECT AVG(POLQA_Score) AS MEANPOLQA FROM VQTPOLQA WHERE (VQT_Timestamp BETWEEN ? AND ?)"> 
     <SelectParameters> 
      <asp:ControlParameter ControlID="TextBox3" DefaultValue="" Name="?" PropertyName="Text" /> 
      <asp:ControlParameter ControlID="TextBox2" Name="?" PropertyName="Text" /> 
     </SelectParameters> 
    </asp:AccessDataSource> 
    <br /> 
    <br /> 
    <br /> 
    <br /> 
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:VQTConnectionString %>" ProviderName="<%$ ConnectionStrings:VQTConnectionString.ProviderName %>" SelectCommand="SELECT DISTINCT [VQuad_PhoneID] FROM [VQTPOLQA]"></asp:SqlDataSource> 
    <br />

Mein aspx.vb Code ist als

Protected Sub btnSave_Click1(ByVal sender As Object, ByVal e As EventArgs) Handles Button2.Click 

     Dim connectionString As [String] = "Provider=Microsoft.ACE.OLEDB.12.0;Data" + " Source=C:\Users\saishnib\Desktop\VQT DB LATEST ORIGINAL (copy)\New folder\VQT.mdb" 
     Dim ds As New DataSet() 
     Dim conn As New OleDbConnection(connectionString) 
     conn.Open() 

     Dim cmd As New OleDbCommand("SELECT ROUND(AVG(POLQA_Score),3) AS MEANPOLQA FROM VQTPOLQA WHERE VQT_Timestamp BETWEEN ? AND ? AND VQuad_PhoneID =?", conn) 

     Dim cmd2 As New OleDbCommand("SELECT ROUND(AVG(RTD),3) AS mean_RTD FROM VQuadData WHERE VQuad_Timestamp BETWEEN ? AND ? AND RTD>0 AND VQuad_PhoneID=?", conn) 

     Dim cmd3 As New OleDbCommand("SELECT Stdev(RTD) AS STDEV_RTD FROM VQuadData WHERE VQuad_Timestamp BETWEEN ? AND ? AND RTD>0 VQuad_PhoneID =?", conn) 

     Dim cmd4 As New OleDbCommand("SELECT Stdev(POLQA_Score) AS STDEV_POLQA FROM VQTPOLQA WHERE VQT_Timestamp BETWEEN ? AND ? VQuad_PhoneID =?", conn) 


     Dim param As OleDbParameter 
     param = cmd.CreateParameter 
     param.OleDbType = OleDbType.Date 
     param.Value = DateTime.Parse(TextBox3.Text) 
     param.ParameterName = "@StartDate" 
     cmd.Parameters.Add(param) 

     Dim param1 As OleDbParameter 
     param1 = cmd.CreateParameter 
     param1.OleDbType = OleDbType.Date 
     param1.Value = DateTime.Parse(TextBox2.Text) 
     param1.ParameterName = "@EndDate" 
     cmd.Parameters.Add(param1) 

     GridView1.DataBind() 

     Dim param2 As OleDbParameter 
     param2 = cmd2.CreateParameter 
     param2.OleDbType = OleDbType.Date 
     param2.Value = DateTime.Parse(TextBox3.Text) 
     param2.ParameterName = "@StartDate" 
     cmd2.Parameters.Add(param2) 

     Dim param3 As OleDbParameter 
     param3 = cmd2.CreateParameter 
     param3.OleDbType = OleDbType.Date 
     param3.Value = DateTime.Parse(TextBox2.Text) 
     param3.ParameterName = "@EndDate" 
     cmd2.Parameters.Add(param3) 

     GridView2.DataBind() 

     Dim param4 As OleDbParameter 
     param4 = cmd3.CreateParameter 
     param4.OleDbType = OleDbType.Date 
     param4.Value = DateTime.Parse(TextBox3.Text) 
     param4.ParameterName = "@StartDate" 
     cmd3.Parameters.Add(param4) 

     Dim param5 As OleDbParameter 
     param5 = cmd3.CreateParameter 
     param5.OleDbType = OleDbType.Date 
     param5.Value = DateTime.Parse(TextBox2.Text) 
     param5.ParameterName = "@EndDate" 
     cmd3.Parameters.Add(param5) 

     GridView3.DataBind() 


     Dim param6 As OleDbParameter 
     param6 = cmd4.CreateParameter 
     param6.OleDbType = OleDbType.Date 
     param6.Value = DateTime.Parse(TextBox3.Text) 
     param6.ParameterName = "@StartDate" 
     cmd4.Parameters.Add(param6) 

     Dim param7 As OleDbParameter 
     param7 = cmd4.CreateParameter 
     param7.OleDbType = OleDbType.Date 
     param7.Value = DateTime.Parse(TextBox2.Text) 
     param7.ParameterName = "@EndDate" 
     cmd4.Parameters.Add(param7) 

     GridView4.DataBind() 


     conn.Close() 

    End Sub 

    Protected Sub DropDownList1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles DropDownList1.SelectedIndexChanged 

    End Sub 

    Protected Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click 
     Response.Clear() 
     Response.AddHeader("content-disposition", "attachment;filename=FileName.xls") 
     Response.Charset = "" 
     Response.ContentType = "application/vnd.xls" 
     Dim stringWrite As New System.IO.StringWriter() 
     Dim htmlWrite As System.Web.UI.HtmlTextWriter = New HtmlTextWriter(stringWrite) 
     GridView6.RenderControl(htmlWrite) 
     Response.Write(stringWrite.ToString()) 
     Response.[End]() 
    End Sub 

    Public Overrides Sub VerifyRenderingInServerForm(ByVal control As Control) 
     Return 
    End Sub 


    Protected Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click 
     Response.Clear() 
     Response.AddHeader("content-disposition", "attachment;filename=FileName.xls") 
     Response.Charset = "" 
     Response.ContentType = "application/vnd.xls" 
     Dim stringWrite As New System.IO.StringWriter() 
     Dim htmlWrite As System.Web.UI.HtmlTextWriter = New HtmlTextWriter(stringWrite) 
     GridView5.RenderControl(htmlWrite) 
     Response.Write(stringWrite.ToString()) 
     Response.[End]() 
    End Sub 

End Class

Quelle

2017-07-20 Snb93

Ok was ist Frage? Welche Codezeile wirft eine Ausnahme auf? Hast du den Code debuggen ?? –

Hallo Chetan Ich erhalte diesen Fehler beim Laden der Website Kein Wert für einen oder mehrere Parameter angegeben. Wie korrigiere ich es? – Snb93

Teilen Sie den page_load-Code ebenfalls mit. Welche Codezeile gibt einen Fehler? –

folgt die SQL-Datenquelle Nach der Bearbeitung, die auf den jeweiligen Grid angebracht ist, dass wir das ändern können? Inhalt zu Control TextBox und DropDown mit der idealen SQL-Abfrage zu sein, löst das Problem.

Quelle

2017-07-31 21:31:29 Snb93

Kein Wert für einen oder mehrere erforderliche Parameter angegeben. System.Data.OleDb.OleDbException:

Antwort

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