Forms Data Controls :: Populating DropDownList In FormView From Code Behind?

Oct 25, 2010

On my formview I have a drop down list that is populated with the names of the files in a certain directory. This works fine, but when the drop down list selected value is bound to the database field I get the following error :

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

I have setup other drop down lists in the same formview populated from SqlDataSources and these all work fine. I can see perhaps why this is an issue because I have not specified a DataValueField or a DataTextField for this drop down that is populated in code (whereas I can for the SQL bound ones) because I'm not sure what these settings would be.

I need to have a "blank" option as well so that the field does not default to the first value in the list.

My code (I have stripped out some meaningless controls) :

[Code]....

My code behind populating the ddl :

[Code]....

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[Code].....

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[Code]....

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[Code]....

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[Code]....

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[Code]....

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