how to use dropdown selected value inside its selectedindexchanged event

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Think the question pretty much sums it up.

My requirement is simple,
1)Have populated a dropdown from database.
2) Based on the selected value in dropdown, I have to show a table.
ie make the table visible for some drop down selections alone.

Now, it looks pretty simple, but Iam breaking my head for the past 2 hours on this.

What I have done is, I have tried checking the dropdown.selectedvalue.text="something" inside the dropdown selected index changed, but it doesnt work.

I know Iam missing something basic here.

Pls guide me in the right path.

Thanks.

Posted 31-Aug-14 5:07am

Mukesh Madhav

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Abhinav S · Answer 1 · 2014-08-31T05:20:00

Solution 1

Try DropDownList.SelectedIndex Property [^] - should be a guide to get stared with selected change.

Posted 31-Aug-14 5:20am

Abhinav S

ChauhanAjay · Answer 2 · 2014-08-31T05:20:00

Solution 2

The below code needs to be written in the selectedindexchanged event of the dropdown.

C#

ComboBox cmb = (ComboBox)sender;
if (cmb.SelectedValue.ToString().Equals("Something")
{
    //Do Something
}

Hope this helps.

Posted 31-Aug-14 5:20am

ChauhanAjay

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Mukesh Madhav 1-Sep-14 1:45am

Thanks Ajay for the reply.

Sorry for being stupid.
But I cant usee ComboBox class, do I need to change the dropdownlist control to a combobox control to accomplish this ?

ChauhanAjay 1-Sep-14 1:57am

No you dont need to change sorry for the misunderstanding.
DropDownList cmb = (DropDownList)sender;
if (cmb.SelectedValue.ToString().Equals("Something")
{
//Do Something
}

The above change should do.

kbrandwijk · Answer 3 · 2014-08-31T05:41:00

Based on the fact that the TS mentioned populating the dropdown from the database, it's very unlikely that SelectedValue is actually a string.
More than likely, ValueMember is bound to the Id of the record in the database, DisplayMember is bound to some Description.

C#

object val = ((ComboBox)sender).SelectedValue; // returns the Id
string txt = ((ComboBox)sender).SelectedText; // returns the text visible on the screen for the selected item
object item = ((ComboBox)sender).SelectedItem; // returns the entire object from the datasource you have bound to the combobox

Depending on your needs, use any of these to retrieve/show further data.