SharePoint Drop down list control throws selected index error

Question

I have an error like below. I have inserted only the SharePoint drop down control alone in my application while clicking save it throws this error

SharePoint drop down control:

<SharePoint:DVDropDownList  ID="ddl_Application" CssClass="form-control" runat="server" ></SharePoint:DVDropDownList>

'ddl_Application' has a SelectedIndex which is invalid because it does not exist in the list of items. Parameter name: value.

I don't know what i did wrong kindly help me to resolve this,Thanks in advance

Swapnil · Accepted Answer · 2017-09-20 10:16:46Z

0

In your case "Source" doesn't return any values. So it can't set a value for SelectedIndex because there is nothing to select.

Check your list if there are any entries.

answered Sep 20 '17 at 10:16

Swapnil

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i didn't bind any values for the controls just added the empty controls alone for that itself it throws exception – Hariprasad Nagendren Sep 20 '17 at 10:18
I didn't use list and nothing just a drop down control only while click save it throws the above error i didn't made anything with that control its empty – Hariprasad Nagendren Sep 20 '17 at 11:14
This sol. sets AppendDataBoundItems="true" on the DropDownList & creates one nullable ListItem so that your DropDownList will bind even when the field in the table is null. The following snippet would provide n option that would be selected when the Application field is null. <SharePoint:DropDownList ID="ddl_Application" runat="server" DataSourceID="SubjectDataSource" DataTextField="fullname" DataValueField="empl_Id" SelectedValue='<%# Bind("Application") %>' AppendDataBoundItems="true"> <asp:ListItem Text="Select" Value="" />< </SharePoint:DropDownList> – Swapnil Sep 20 '17 at 11:14

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