Error In Searching Records

Hi

I am developing windows application.


I want to find records which has a particular number which is entered in textbox.
and result is displayed in datagrid.

If the entered number didnt find in database it must be displayed msg.

i tried it like as below but not working.

qlConnection conn = new SqlConnection();
            conn.ConnectionString = "Server=EBSERVER;UID=sa;Database=Airport-Clearance;";
            //SqlConnection sqlconn = objcs.GetConnection();
            //MessageBox.Show("Connected");
            //sqlconn.Open();
            //Do what ever
            
            SqlDataAdapter filling = new SqlDataAdapter("select * from Airport where awb='" + txtawb.Text ,conn);
            
            DataSet displaying = new DataSet();
            
            conn.Open();
            filling.Fill(displaying);
            dataGrid1.DataSource = displaying.DefaultViewManager;
            conn.Close();

Waiting for reply.

Warmest regards,
ASIF