Login Code Not Working

try
                {
                    comm.CommandText = "SELECT COUNT(*)  FROM Accounts WHERE username = '" + txtUsername.Text + "' and passcode = '" + txtPasscode.Text + "'";;
                    int count = comm.ExecuteScalar();
                   if (count > 0)
                    {
 this.Frame.Navigate(typeof(HomeStudent));
                    }
                    else 
                    {
                       //LOGIN FAILED
                    }
                }

                catch
                {

                }

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