Getting error even the username and password is correct from backend SQL server

private void button1_Click_1(object sender, EventArgs e)
      {
          string cs = @"Data Source=.;Database=master;Integrated Security=True;";


          if (textBox1.Text == "" || textBox2.Text == "")
          {
              MessageBox.Show("Please provide UserName and Password");
              return;
          }
          try
          {
              //Create SqlConnection
              SqlConnection con = new SqlConnection(cs);
              SqlCommand cmd = new SqlCommand("Select * from Register where UserNmae=@username and Password=@password", con);
              cmd.Parameters.AddWithValue("@username", textBox1.Text);
              cmd.Parameters.AddWithValue("@password", textBox2.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!");
                  this.Hide();
                  Dashboard dsb = new Dashboard();
              }
              else
              {
                  MessageBox.Show("Login Failed!");
              }
          }
          catch (Exception ex)
          {
              MessageBox.Show(ex.Message);
          }