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Gridview Editing with dropdown lists inside

Posted By:      Posted Date: September 07, 2010    Points: 0   Category :ASP.Net
  Hi, Any good  Example for Editable Grid with dropdownlist inside ? Getting some problem in updating the data   Thanks 

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Gridview with a dropdown list for editing


Hello. I am working through Scott Mitchell's ASP.Net in 24 hours book. I am finishing the photo album project.

I have a GridView that retrieves a list of uploaded photo rows for the logged-in user.
The GridView is for editing and deleting rows.

The photo Category field in the Gridview is a dropdown list. The text entry field was deleted after converting this field to a Template.

Like the uploaded photos, these Categories are user-specific. They are created in another web page.

Users also have the option to select "none" for the category when they upload an image.

For the GridView:  The Category ID field's ItemTemplate and EditItemTemplate both have a " - None - " choice added to them.

I am getting this error:

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


Note: The ID for the ItemTemplate for that dropdown list is the ID listed above in the error: "pictureReadOnlyCategories".


Am I missing some step in this process of changing a GridViews text field to a dropdown that can be used for editing? I went through the book's instructions three times.

Here is my code for the dropdown list and a screenshot of the Design

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I'm trying to create a page with multiple fields to be used as parameters for filtering a GridView.  I'm using a combination of two asp:dropdown lists and two check boxes.   When I select a value in one ddl, I want to clear the value in the other ddl.  I was trying to use the event "onTextChanged" but that doesn't seem to fire off on the client side and I cannot seem to find any event for an asp:ddl or asp:checkbox or asp:radio button that fires off on the client side. 

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<asp:GridView ID="GridViewEmply"  DataKeyNames="EmployeeID" runat="server"
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The GridView allows editing on a row-by-row basis. An editable GridView contains an additional column with an Edit button in each row. When the end user clicks on an Edit button that row becomes editable, causing the Edit button to change to Update and Cancel buttons and the other columns to become TextBoxes. The end user can then update one or more column values and click Update to save their changes.

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<asp:TemplateField HeaderText="Enter OTP">
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here is the code page: 

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