Question

While I establish a connection to SQL Server using ADO.NET, it showing errors.

Following is the code:

SqlConnection con = new SqlConnection("Data Source=.\\SQLEXPRESS;Initial Catalog=abdul;Integrated Security=true");
SqlCommand cmd = new SqlCommand();

con.Open();

String str="select * from emp where empname='Abdul'";
cmd = new SqlCommand(str, con);

SqlDataReader dr = cmd.ExecuteReader();

if (dr == null || !dr.HasRows)
{
   MessageBox.Show("No Records found");
}
else
{
   while (dr.Read())
   {
      textBox1.Text = dr[0].ToString();
      textBox2.Text = dr[1].ToString();
   }
}

When I am running the project it showing the following error:

Cannot open database “abdul” requested by the login. The login failed.

What have to do?

Answer 1

The login is successful at the the SQL Server level. Then either

• the database exists but the login you are using doesn’t have access to the database
• the database doesn’t exist

In SSMS, go to adbul database. Expand the security node and add the relevant users (which map to the login) + security there. If you still can’t, have you created the database single user?

It’s hard to give more details at the moment.