Checking if a datatable is null

Question

The following code is what I\'ve been using to retrieve user information from a sql database.

            string userName = LoginUser.UserName;
            strin         


        

Answer 1

You will get an empty DataTable if no records match, so you can check on the number of records returned:

if (dt.Rows.Count > 0)

And, slightly off topic, please read the comments below your question, then Google the terms SQL Injection and Parameterized SQL statements. Try starting with this.