selectedIndexChanged for data table is not working in c#

Question

I have implented a drop down list and I want to populate the data table according to the selected value in the drop down list. But currently I am unable to display the selectedIndexChanged. Please assist.

  protected void ddlitem_SelectedIndexChanged(object sender, EventArgs e)
        {
            DataTable result = new DataTable();

            result.Columns.Add("Supplier");
            result.Columns.Add("Country");
            result.Columns.Add("Partnership Duration");
            result.Columns.Add("Partnership Type");

            int intMemberIndex = 0;
            try
            {
                foreach (SPListItem objtestListItem in objtestList.Items)
                {
                    string SupplierName = objtestListItem["Supplier"].ToString();
                    string Country = objtestListItem["Country"].ToString();
                    string PD = objtestListItem["Partnership Duration"].ToString();
                    string PT = objtestListItem["Partnership Type"].ToString();
                    intMemberIndex = objtestListItem.ID;

                    for (int i = 0; i < ddlitem.Items.Count; i++)
                    {
                        if (ddlitem.Items[i].Text.Equals(SupplierName))
                        {
                            result.Rows.Add(SupplierName, Country, PD, PT);


                        }
                    }

                } this.resultGrid.DataSource = result;
                this.resultGrid.Visible = true;
                this.resultGrid.DataBind();
            }
            catch (Exception ex)
            {

                lblTxt.Text = ex.Message;
            }


        }



    }

@Dwayne Johnson: What do you mean by "I am unable to display the selectedIndexChanged"? What is the usage scenario and what is the expected as well as actual behavior now? — Kangkan, Nov 10 '11 at 05:54
@Kangkan I am populating the drop down list from the sharepoint column and I wish to select a particular item from the dropdown and display related columns matching to the item selected from the dropdown list. — Dwayne Johnson, Nov 10 '11 at 05:57
@V4Vendetta I did not set Autopostback = true. Where do you set that? — Dwayne Johnson, Nov 10 '11 at 05:57
@V4Vendetta how to make it work for data table? in displaying of the resultGrid is it the same? — Dwayne Johnson, Nov 10 '11 at 06:00

score 0 · Answer 1 · answered Nov 10 '11 at 06:11

0

The markup for the dropdown should be like bellow

<asp:DropDownList ID="ddlitem" AutoPostBack="true" runat="server" OnSelectedIndexChanged="ddlitem_SelectedIndexChanged">
</asp:DropDownList>

this will call ddlitem_SelectedIndexChanged and bind data to resultGrid.

you may need following code inside your page load method to execute something ONLY on first load

if(!Page.IsPostBack)
{
   //Control Initialization
   //Databinding
}

answered Nov 10 '11 at 06:11

Damith

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What does the if statement do? – Dwayne Johnson Nov 10 '11 at 06:14
@DwayneJohnson http://stackoverflow.com/questions/3620883/when-do-you-use-if-ispostback-in-asp-net – Damith Nov 10 '11 at 06:21

selectedIndexChanged for data table is not working in c#

1 Answers1