please send me correct query

Hi,

You forgot apostrophes, and you forgot an AND or OR:

string verifyinfo = "select imagelist, pass from Gpass where userid='" + txtuserid.Text + "' AND email='" + txtemail.Text + "'";

But don't use string concatenation to build queries, because using string concatenation doesn't prevent SQL injection[^]. Use a SqlParameter to pass a parameter:
http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlparameter.aspx[^]
http://www.dotnetperls.com/sqlparameter[^]

If you use a SqlParameter, try this code:

using (SqlCommand command = new SqlCommand("select imagelist, pass from Gpass where userid=@userid AND email=@email", connection))
	    {
		command.Parameters.Add(new SqlParameter("userid", txtuserid.Text));
		command.Parameters.Add(new SqlParameter("email", txtemail.Text));
		SqlDataReader reader = command.ExecuteReader();
		// some other code
	    }

I recommend to use SqlParameter to prevent SQL injection.