code to change DropDownList select

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Hi all,
my case is that i want to write a code to change the selected value of the dropdownlist actually i have 2 values (True, False).
I tried

C#

SolvedDropDownList.SelectedItem.Text = solved;

but it's making the both options False...
i thought i did it wrong coz i have to change the selected item not the text of the selected item.. but i dont know how to do it.. please could someone help me...

[Edit] Added Code Snippet [/Edit]

Posted 29-Dec-10 1:32am

shadi_abushaar

Updated 29-Dec-10 1:45am

@nuraGGupta@

v2

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Hiren solanki 30-Dec-10 12:54pm

Comment from velmahesh : Hi shadi_abushaar,

did u use the AutoPostback =true ?.. in aspx page

3 solutions

Solution 2

As you said, SelectedItem is read-only. But, SelectedValue is not.

If you have two items in your dropdownlist with string values of "True" and "False", then you just set the SelectedValue property as in

C#

SolvedDropDownList.SelectedValue = solved;

But that does depend on what solved is and what is contained in the items in your dropdownlist.

If you did this:

C#

SolvedDropDownList.Items.Add(true);
SolvedDropDownList.Items.Add(false);

it would add two items with the string representations of true and false.

Then, if solved was a boolean you should be fine.

Posted 29-Dec-10 7:35am

William Winner

Comments

fjdiewornncalwe 29-Dec-10 16:02pm

Well explained...

Solution 3

//Clear the previously selected values
SolvedDropDownList.ClearSelection();

//Iterate through all the items and selected the one you want.
foreach(ListItem item in SolvedDropDownList.Items)
{
if (item.Value == solved)
{
item.Selected = true;
break;
}
}

Hope this helps.
Tajinder Sarao

Posted 29-Dec-10 9:12am

Tajinder Sarao

Comments

fjdiewornncalwe 29-Dec-10 16:03pm

Highly inefficient way of doing this. See William's answer for the solution.

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@nuraGGupta@ · Accepted Answer · 2010-12-29T01:44:00

Solution 1

Suppose the value of your true and false is 1 and 2 respectively. (To check this, see the source code of drop down when the page is rendered)

C#

//SolvedDropDownList.SelectedItem=1 //for true

//SolvedDropDownList.SelectedItem=2 //for false

SolvedDropDownList.SelectedValue=1 //for true

SolvedDropDownList.SelectedValue=2 //for false

I hope you got the nerve.

Anurag

Posted 29-Dec-10 1:44am

@nuraGGupta@

Updated 29-Dec-10 16:48pm

v2

Comments

Hiren solanki 29-Dec-10 8:00am

Good answer anurag.

@nuraGGupta@ 29-Dec-10 8:03am

Thanks. :-)

shadi_abushaar 29-Dec-10 8:19am

but that's not the way cz SolvedDropDownList.SelectedItem is read only that means you can't assign values to it.. i tried this also...

William Winner 29-Dec-10 13:31pm

SelectedItem is read-only

fjdiewornncalwe 29-Dec-10 16:03pm

This simply won't work. See William's answer above for the correct solution.

@nuraGGupta@ 29-Dec-10 22:46pm

I am really sorry. I just typed in here without checking the code on the editor so did this mistake. I have updated the answer. Please check, if it can do.