Exception

Question

Good Day

May anyone assist me, i am still a junior is applications development and i am developing an application. have reached my login button to send me to another form. please assist me any body my code below, when i run it it throws this exception 

 

An unhandled exception of type 'System.NotImplementedException' occurred in Balanced ScoreCard.exe

Additional information: The method or operation is not implemented.

 

try

{

if (!(usertxt.Text == string.Empty))

{

if (!(userpa.Text == string.Empty))

{

String str = "server=MSIZI-PC03;database=windowapp;UID=sa;password=123";

String query = "select * from data where username = '" + usertxt.Text + "'and password = '" + this.userpa.Text + "'";

SqlConnection con = new SqlConnection(str);

SqlCommand cmd = new SqlCommand(query, con);

SqlDataReader dbr;

con.Open();

dbr = cmd.ExecuteReader();

int count = 0;

while (dbr.Read())

{

count = count + 1;

}

if (count == 1)

{

MessageBox.Show("username and password is correct");

}

else if (count > 1)

{

MessageBox.Show("Duplicate username and password", "Login Form");

}

else

{

MessageBox.Show(" username and password incorrect", "Login Form");

}

}

else

{

MessageBox.Show(" password empty", "Login Form");

}

}

else

{

MessageBox.Show(" username empty", "Login Form");

}

// con.Close();

}

catch (Exception)

{

FrmMain.show();

}