Ungültiger Objektname tabl_login

Question

So ist es in den Tabellen und ich habe online gesucht aber nichts konnte helfen. Hier ist der Code. Ich verstehe nicht, warum es mir jetzt Wanzen gibt, es war vorher nicht.

Ich benutze Visual Studio 2015 BTW.

public partial class loginpage : Form 
{ 
    public loginpage() 
    { 
      InitializeComponent(); 
    } 

    // Connection String 
    string cs = @"Data Source=MS-LAPTOP\SQLEXPRESS;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"; 
    //btn_Submit Click event 

    public sealed class SecurePasswordHasher 
    { 
     /// <summary> 
     /// Size of salt 
     /// </summary> 
     private const int SaltSize = 16; 

     /// <summary> 
     /// Size of hash 
     /// </summary> 
     private const int HashSize = 20; 

     /// <summary> 
     /// Creates a hash from a password 
     /// </summary> 
     /// <param name="password">the password</param> 
     /// <param name="iterations">number of iterations</param> 
     /// <returns>the hash</returns> 
     public static string Hash(string password, int iterations) 
     { 
       //create salt 
       byte[] salt; 
       new RNGCryptoServiceProvider().GetBytes(salt = new byte[SaltSize]); 

       //create hash 
       var pbkdf2 = new Rfc2898DeriveBytes(password, salt, iterations); 
       var hash = pbkdf2.GetBytes(HashSize); 

       //combine salt and hash 
       var hashBytes = new byte[SaltSize + HashSize]; 
       Array.Copy(salt, 0, hashBytes, 0, SaltSize); 
       Array.Copy(hash, 0, hashBytes, SaltSize, HashSize); 

       //convert to base64 
       var base64Hash = Convert.ToBase64String(hashBytes); 

       //format hash with extra information 
       return string.Format("$MYHASH$V1${0}${1}", iterations, base64Hash); 
     } 

     /// <summary> 
     /// Creates a hash from a password with 10000 iterations 
     /// </summary> 
     /// <param name="password">the password</param> 
     /// <returns>the hash</returns> 
     public static string Hash(string password) 
     { 
       return Hash(password, 10000); 
     } 

     /// <summary> 
     /// Check if hash is supported 
     /// </summary> 
     /// <param name="hashString">the hash</param> 
     /// <returns>is supported?</returns> 
     public static bool IsHashSupported(string hashString) 
     { 
       return hashString.Contains("$MYHASH$V1$"); 
     } 

     /// <summary> 
     /// verify a password against a hash 
     /// </summary> 
     /// <param name="password">the password</param> 
     /// <param name="hashedPassword">the hash</param> 
     /// <returns>could be verified?</returns> 
     public static bool Verify(string password, string hashedPassword) 
     { 
       //check hash 
       if (!IsHashSupported(hashedPassword)) 
       { 
        throw new NotSupportedException("The hashtype is not supported"); 
       } 

       //extract iteration and Base64 string 
       var splittedHashString = hashedPassword.Replace("$MYHASH$V1$", "").Split('$'); 
       var iterations = int.Parse(splittedHashString[0]); 
       var base64Hash = splittedHashString[1]; 

       //get hashbytes 
       var hashBytes = Convert.FromBase64String(base64Hash); 

       //get salt 
       var salt = new byte[SaltSize]; 
       Array.Copy(hashBytes, 0, salt, 0, SaltSize); 

       //create hash with given salt 
       var pbkdf2 = new Rfc2898DeriveBytes(password, salt, iterations); 
       byte[] hash = pbkdf2.GetBytes(HashSize); 

       //get result 
       for (var i = 0; i < HashSize; i++) 
       { 
        if (hashBytes[i + SaltSize] != hash[i]) 
        { 
         return false; 
        } 
       } 
       return true; 
      } 
} 

private void button2_Click(object sender, EventArgs e) 
{ 
    //Hash 
    var hash = SecurePasswordHasher.Hash("password"); 

    //Verify 
    var result = SecurePasswordHasher.Verify("password", hash); 

    if (txtUsername.Text == "" || txt_Password.Text == "") 
    { 
     MessageBox.Show("Please provide a Username and Password"); 
     return; 
    } 

    try 
    { 
     //Create SqlConnection 
     SqlConnection con = new SqlConnection(cs); 

     SqlCommand cmd = new SqlCommand("Select * from tabl_login where UserName=@username and Password=@password", con); 
     cmd.Parameters.AddWithValue("@username", txtUsername.Text); 
     cmd.Parameters.AddWithValue("@password", txt_Password.Text); 

     con.Open(); 

     SqlDataAdapter adapt = new SqlDataAdapter(cmd); 
     DataSet ds = new DataSet(); 
     adapt.Fill(ds); 

     con.Close(); 

     int count = ds.Tables[0].Rows.Count; 

     //If count is equal to 1, than show frmMain form 
     if (count == 1) 
     { 
      MessageBox.Show("Login Successful!"); 

      Form1 objFrmMain = new Form1(); 
      this.Hide(); 
      objFrmMain.ShowDialog(); 
      this.Close(); 
     } 
     else 
     { 
      MessageBox.Show("Login Failed!"); 
     } 
    } 
    catch (Exception ex) 
    { 
     MessageBox.Show(ex.Message); 
    } 
} 

Und auch hier ist ein Screenshot

Answer 1

Ihre Verbindung srtring nicht korrekt. Es hat den Namen der Datenbank verpasst.

// Connection String 
    string cs = @"Data Source=MS-LAPTOP\SQLEXPRESS;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"; 

ändern es zu

// Connection String 
    string cs = @"Data Source=MS-LAPTOP\SQLEXPRESS;Integrated Security=True;Initial Catalog=DataBaseName;Connect Timeout=15;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"; 

Answer 2

Sie wollen es

[database]. [Schema]. [Tabellenname]

statt tabl_login