How to fetch record from database to dropdown in C# coading

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i have taken 2 dropdowns according to one dropdown another dropdown filling data. but while fetching record 2nd dropdown not getting record from database

What I have tried:

for fetching record from database i have use this code:
ddldropdownname.SelectedIndex = ddldropdownname.Items.IndexOf(ddldropdownname.Items.FindByText(sdr["value"].ToString()));

Posted 22-Aug-16 21:41pm

Member 12662265

Updated 22-Aug-16 23:42pm

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Tushar sangani · Answer 1 · 2016-08-22T23:42:00

you have want like cascading drop down.

Programming With Sangani: Cascading Dropdownlist using webservices[^]

or you want with out cascading

1st dropdown generate event selected index change and set autopostback ="true" like

ASP.NET

<asp:dropdownlist id="dropcategory" runat="server" cssclass="styled span12"  AutoPostBack="True" onprerender="dropcategory_PreRender"                          onselectedindexchanged="dropcategory_SelectedIndexChanged">                        </asp:dropdownlist>

and Code Behind Selected Change event write below code. changes as per your requirment

C#

if (dropcategory.SelectedIndex != 0)
            {
                DataTable objdt = new DataTable();
                objdt = odal.selectbyquerydt("Select * from Sub_category_Master where cid ='" + Convert.ToInt32(dropcategory.SelectedValue) + "'");
                dropsubcategory.DataSource = objdt;
                dropsubcategory.DataValueField = "id";
                dropsubcategory.DataTextField = "Subcategory";
                dropsubcategory.DataBind();
                dropsubcategory.Items.Insert(0, "----Select----");

            }