How to assign drop downlist datasource dynamically? in ASP.NET

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Home » Questions & Answers » How to assign drop downlist datasource dynamically?

How to assign drop downlist datasource dynamically?

6/10/2008

Author: Suvendu Swain
Aptech Softwares

Hi,
I have 20 drop downlist in my page,
Named as :
DropdownList1
DropdownList2
DropdownList3
- - - - - - - - - - -
- - - - - - - - - - -
- - - - - - - - - - -
- - - - - - - - - - -
DropdownList20

and I have to assign the same array to all the dropdowns, so instead of assigning manually to all the drop downs I want to use for loop.

like

for(int i=1;i<=20;i++)

{
eval("DropdownList"+i).DataSource=options;
eval("DropdownList"+i).Databind();
}

But by using eval this not possible and I am unable to use the typecasting too. can any one please help regarding this.

Thanks and Regards,
Subhendu Swain

Answers .............

Author: Suvendu Swain

Aptech Softwares

Posted Date: 6/11/2008

HelpPlz

Author: Rod Tidwell

Posted Date: 6/21/2008

http://aspspider.info/antartica

Antartica

Hi,

You can create an array of dropdownlists or a List<DropDownList> that you populate with all your dropdownlists. Then you iterate through that list (thanks to "foreach") and do whatever you want to do.

Author: Stephen Debreczeny

Posted Date: 7/2/2008

you can use in Page Load
"dropdownlistid.datasource = datasourcecontrolid
dropdownlistid.databind()"

Author: Jean-Francois Blouin

Posted Date: 9/24/2008

http://aspspider.net/JFBlouin

House for rent

Your DropdownList controls also seem to be ID'ed DropdownList1, DropdownList2 etc... so in the for loop, you can do:

for(int i=1;i<=20;i++)
{
Page.FindControl("DropdownList"+i).DataSource=options;
Page.FindControl("DropdownList"+i).Databind();
}

Jeff

Author: Mani

Student

Posted Date: 9/25/2008

http://aspspider.info/Manis

HEC Scholarship Programme

for(int i=1;i<=20;i++)
{
DropdownList+i.DataSource= objDatatable;
DropdownList+i.DataTextField = "TextToBeDisplayed";
DropdownList+i.DataValueField="ValueToUsedBehindTheScene";
DropdownList+i.Databind();
}

Author: Rod Tidwell

Posted Date: 9/28/2008

http://aspspider.info/antartica

Antartica

Mani... I think you should practice more lol. What you write is nonsense, sorry.

Author: Naveen Sharma

Posted Date: 9/28/2008

Try something like this, you may want to start another for loop inside the for each loop

Private Sub binddd()
dim i as integer=1
For Each ocontrol As Control In Page.Controls
If ocontrol.ID = "DropdownList" + i Then
Dim dd As DropDownList
dd = CType(ocontrol, DropDownList)
dd.DataSource = Options'--your array

dd.DataBind()
i+=1
End If
Next
End Sub

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