check if returns anything.

[daimous]

hi! can anybody please help me. Given the code below how can i check if it does returns anything.

                string SqlConnStr = Properties.Settings.Default.MyConnString;
                sqlConn = new SqlConnection(SqlConnStr);
                sqlConn.Open();
                qryStr = "Select username from users where username = '" + txtNewUsername.Text.ToUpper() + "'";
                SqlCommand sqlCmd = new SqlCommand(qryStr, sqlConn);
                object result = sqlCmd.ExecuteScalar();

Thanks advance!!!