Object reference not set to an instance of an Object

[Benjamin]

This error pop-up message keeps appearing whenever I enter a text.
I've tried searching for solutions and examples but I get the "Sorry, we couldn't find the page you're looking for." whenever I click on the "Launch ASP.NET AJAX Demos" link (http://demos.telerik.com/ErrorPageResources/error.aspx?aspxerrorpath=/aspnet-ajax/default.aspx).

My code is something like this:

<telerik:RadAutoCompleteBox ID="RadAutoCompleteBox1" runat="server"></telerik:RadAutoCompleteBox>

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack) {

                RadAutoCompleteBox1.DataSource = GetData();
                RadAutoCompleteBox1.DataTextField = "Item_Desc";
                RadAutoCompleteBox1.DataValueField = "Item_Code";

            }
        }

private static DataTable GetData()
        {
            DataTable dt = new DataTable();
            //Set the datafield name
            DataColumn cl = new DataColumn("status");
            dt.Columns.Add(cl);
            cl = new DataColumn("Item_Code");
            dt.Columns.Add(cl);
            cl = new DataColumn("Item_Desc");
            dt.Columns.Add(cl);
            cl = new DataColumn("Vendor_Name");
            dt.Columns.Add(cl);
            cl = new DataColumn("Uom");
            dt.Columns.Add(cl);
            cl = new DataColumn("Moq");
            dt.Columns.Add(cl);
            cl = new DataColumn("Qty");
            dt.Columns.Add(cl);
            cl = new DataColumn("Cur");
            dt.Columns.Add(cl);
            cl = new DataColumn("Price");
            dt.Columns.Add(cl);
            cl = new DataColumn("Total");
            dt.Columns.Add(cl);
            cl = new DataColumn("Type");
            dt.Columns.Add(cl);


            //Set the static data for row 1
            DataRow dr = dt.NewRow();
            dr[0] = "";
            dr[1] = "07-11-017";
            dr[2] = "PAPER PUNCHER (3 HOLES)";
            dr[3] = "Internal";
            dr[4] = "PC";
            dr[5] = "1";
            dr[6] = "1";
            dr[7] = "SGD";
            dr[8] = "130.00";
            dr[9] = "130.00";
            dr[10] = "NS";
            dt.Rows.Add(dr);


            //Set the static data for row 2
            dr = dt.NewRow();
            dr[0] = "";
            dr[1] = "07-09-069";
            dr[2] = "BINDING STRIPS A4 (MULTI-COLOUR) (LOT OF 100/50PC) ";
            dr[3] = "Internal";
            dr[4] = "PC";
            dr[5] = "1";
            dr[6] = "1";
            dr[7] = "SGD";
            dr[8] = "60.00";
            dr[9] = "60.00";
            dr[10] = "NS";
            dt.Rows.Add(dr);

            //Set the static data for row 3
            dr = dt.NewRow();
            dr[0] = "";
            dr[1] = "01-38-002";
            dr[2] = "LAMINATING MACHINE A4, LMA400";
            dr[3] = "Internal";
            dr[4] = "PC";
            dr[5] = "1";
            dr[6] = "1";
            dr[7] = "SGD";
            dr[8] = "160.00";
            dr[9] = "160.00";
            dr[10] = "NS";
            dt.Rows.Add(dr);

            //Set the static data for row 4
            dr = dt.NewRow();
            dr[0] = "";
            dr[1] = "99-09-901";
            dr[2] = "BOLTED CONNECTOR";
            dr[3] = "Internal";
            dr[4] = "PC";
            dr[5] = "10";
            dr[6] = "10";
            dr[7] = "SGD";
            dr[8] = "1.50";
            dr[9] = "15.00";
            dr[10] = "ST";
            dt.Rows.Add(dr);

            //Set the static data for row 5
            dr = dt.NewRow();
            dr[0] = "";
            dr[1] = "99-07-905";
            dr[2] = "GUY STRAIN INSULATOR";
            dr[3] = "Internal";
            dr[4] = "PC";
            dr[5] = "100";
            dr[6] = "100";
            dr[7] = "SGD";
            dr[8] = "1.00";
            dr[9] = "100.00";
            dr[10] = "ST";
            dt.Rows.Add(dr);

            //Set the static data for row 6
            dr = dt.NewRow();
            dr[0] = "";
            dr[1] = "99-01-505";
            dr[2] = "HOT LINE CLAMP";
            dr[3] = "Internal";
            dr[4] = "PC";
            dr[5] = "500";
            dr[6] = "500";
            dr[7] = "SGD";
            dr[8] = "2.00";
            dr[9] = "1000.00";
            dr[10] = "ST";
            dt.Rows.Add(dr);

            return dt;
        }

[Princy]

Hi,

The autocompletetextbox control triggers page load every time you type on the control - even if you wrap the control with an update panel. So,  you must bind the datasource in the Page_Load method(without !IsPostBack) in order to solve this problem as follows.

C#:

protected void Page_Load(object sender, EventArgs e)
{
        RadAutoCompleteBox1.DataSource = GetData();
        RadAutoCompleteBox1.DataTextField = "Item_Desc";
        RadAutoCompleteBox1.DataValueField = "Item_Code";
}

Hope this helps.

Regards,
Princy.

[Benjamin]

It solved my issue! Thanks!