Drop down List items getting Cleared after Post back in aspx page.

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Hi,

In my aspx page the DropdownList Items are getting binded when the page is not post back(first time loading) but when I clicked any button like (save ,edit)( all the drop down List items are getting Cleared.

can any one plz help, am i missing any settings for the dropdown list.

I put

Page.EnableViewState = true;

above the If(!ispostback)

The code inside the If(!IsPostback)
is

Parameters param = new Parameters();
DataSet datasetddlInternetwght = new DataSet();
datasetddlInternetwght = param.GetDDLListInternetWght();
ddlIntrntweight.DataTextField = datasetddlInternetwght.Tables[0].Columns["paramname"].ToString();
ddlIntrntweight.DataValueField = datasetddlInternetwght.Tables[0].Columns["paramvalue"].ToString();
ddlIntrntweight.DataSource = datasetddlInternetwght;
ddlIntrntweight.DataBind();

where Parameters is a class in a separate .cs file. I am getting the Data binded when the Page is loaded for the first time but when any button got clicked the items in the Drop down list(ddlIntrntweight) are getting cleared. i enabled the View state for the Drop down list;

Posted 3-Jul-11 0:30am

narayana4057

Updated 24-Feb-19 22:11pm

Monjurul Habib

v6

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mhamad zarif · Answer 1 · 2011-07-03T00:58:00

Solution 1

You should enable view state.Go to properties of the DropdownList and set enableviewstate to true.

Posted 3-Jul-11 0:58am

mhamad zarif

Comments

narayana4057 4-Jul-11 0:33am

Hi thanks for ur information, the Enable View state Property is already true for the Dropdown list.

Monjurul Habib · Answer 2 · 2011-07-04T09:25:00

Solution 6

Please make sure the follow steps:

1) Bind the drop down like

if (!Page.IsPostBack)
       {
           ddlIntrntweight.DataSource = SqlDataSource1;
           ddlIntrntweight.DataBind();
       }

2) Make sure

AutoPostBack="True"

3) Make sure

EnableViewState="True";

Posted 4-Jul-11 9:25am

Monjurul Habib

Comments

Tech Code Freak 5-Jul-11 5:27am

My 5!

Monjurul Habib 5-Jul-11 5:46am

thank you.

De, Subhendu · Answer 3 · 2011-07-03T09:11:00

Solution 2

There must be some problem in your code. I would appreciate if you share your code....

++Subhendu

Posted 3-Jul-11 9:11am

De, Subhendu

koolprasad2003 · Answer 4 · 2011-07-03T18:50:00

Solution 3

When you clicked any button of your web page, each time PAGE_LOAD event get called.

what you have written in your PAGE_LOAD() do add the that code under if not post back.

if(! isPostBack)
{
  //Page load code here
}

Hope it helps

Posted 3-Jul-11 18:50pm

koolprasad2003

Sachin__Sharma · Answer 5 · 2011-07-03T19:36:00

Solution 4

if(! isPostBack)
{
  //I think you put your code here and set the EnableViewState property false;
  //set the EnableViewState property true or dont put your code here.
}

Posted 3-Jul-11 19:36pm

Sachin__Sharma

Member 14107716 · Answer 6 · 2019-02-24T22:12:00

Solution 7

Another place this can get set is on the markup in the ASPX...

<%@ Page Title="" ViewStateMode="Enabled" Language="C#" MasterPageFile="~/Default.Master" AutoEventWireup="true"

Posted 24-Feb-19 22:12pm

Member 14107716