AutoPostBack issue in DropDownList Event

Question

Sir I have going through a function in My ASP.NET Project to fill GridView as per the selection in DropDownList item. I could not get the proper data because of AutoPostBack fires everytime. i.e the DataValueField and DataTextField value of DropDown always being the value of first row. Data in DropDownlist are :- The issue is suppose I select mobile from DropDownList  the AutoPostBack event fires and the value turn from productId 3 to 1 . the function which I write in c# to load the GridView is :- Please help me to solve this issue.

Vipan Sharma · Answer

Follow below protected void Page_Load(object sender EventArgs e) { if (!IsPostBack) { LoadProductForGridView(); //your function } }

Vipan Sharma · Answer

use ispostback on page load event. your are doing wrong protected void Page_Load(object sender EventArgs e) { if (!IsPostBack) { LoadProductForGridView(); //your function } }

Nilesh Joshi · Answer

Hi In side LoadProductForGridView() you arereading the valuefrom ddlProductType. If youcall the function on Page_Load() inside !IsPostBack ddlProductType won't have any value selected. If you call LoadProductForGridView() functionon SelectedIndexChangedit will but instead of using ddlProductType.SelectedValueyou need to use as follows: string selectedProduct =((DropdownList)sender).SelectedValue; then use selectProduct value to pass @as_ProductID parameter value to your stored procedure. Hope that helps Thanks

Upendra Pratap Shahi · Answer

Hi use this with below code- protected void Page_Load(object sender EventArgs e) { if (!IsPostBack) { LoadProductForGridView(); //your function called here } }

Bineesh VP · Answer

#Upendra Pratap I did as per your suggestion but the issue still not solved I set AutoPostBack of DropDownList =True and it always postback into the first row of the DropDownList i.e the selectedValue of DropDownList always being ProductID=1. modified code :-

Upendra Pratap Shahi · Answer

Try to call your function in isPostback.