retaining value of dynamic dropdownlist on postback

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Hi , i have a issue..
i have dynanically bounded the data from the database(sqlserver 2008 express) to a dropdownlist.(on VS2010. Whenever i change the value from default to something else in dropdownlist...it comes back to the original value(and not the selected one)....i tried to write the code on Page Init as well... but then it does not shows the value at all in dropdownbox after postback....Please help..

here is the code(dropdownlist autopostback is true)

Page_init
{
...connection....
da.fill(dt);
dropdownlist1.datasource=dt;
dropdownlist1.datatextfield="city"
dropdownlist1..databind();
}

Regards.

Posted 14-May-11 0:50am

shikhar gilhotra

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LakshmiNarayana Nalluri · Answer 1 · 2011-05-15T20:10:00

if(!ispostback)
{
sqldataadapter da=new sqldataadapter("select * from table",cn);
datatable dt=new datatable();
da.fill(dt);
dropdownlist1.datasource=dt;
dropdownlist1.datatextfield="col";
dropdownlist1.datavaluefield="col";
dropdownlist1.databind();
dropdownlist1.items.insert(0,"Select");
}

Wonde Tadesse · Answer 2 · 2011-05-14T11:49:00

You have to check whether postback event is fired or not. I put some code below.

C#

protected override void OnInit(EventArgs e)
    {
            base.OnInit(e);

            if (!IsPostBack)
            {
                // Put your logic here.
              da.fill(dt);
              dropdownlist1.DataSource=dt;
              dropdownlist1.DataTextField="city"
              dropdownlist1.DataValuefield="city" // you may need to add it.
              dropdownlist1.Databind();

            }

    }

I hope this helps you well.

anvas kuttan · Answer 3 · 2011-05-14T01:03:00

Solution 2

hi,

C#

if (IsPostBack)
               return;
...connection....
da.fill(dt);
dropdownlist1.datasource=dt;
dropdownlist1.datatextfield="city"
dropdownlist1..databind();

1

try this one put this code on page load or Page_init

Posted 14-May-11 1:03am

anvas kuttan

Updated 14-May-11 1:04am

v2

Comments

shikhar gilhotra 14-May-11 7:24am

NOOOOOOO... thats what i dont want ..can you please read the issuer again ???

tulasiram3975 · Answer 4 · 2011-05-14T00:53:00

Solution 1

You Need To Recreate again after postback i hope solves the problem

Posted 14-May-11 0:53am

tulasiram3975

retaining value of dynamic dropdownlist on postback

4 solutions

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