Gridview_RowUpdating not setting null to newvalue

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I have a gridview that uses entitydatasource (EF4) to select, update and delete.

I use dropdownboxes in some columns.

In the RowUpdating method, I get the selectedvalue of the dropdownbox and check the value.

If the value is "0" then I set the NewValue to be Null like this:

        protected void gwTestProducts_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            DropDownList ddlTestUser = ((DropDownList)((GridView)sender).Rows[e.RowIndex].FindControl("ddlTestUser"));
            int testUserID = int.Parse(ddlTestUser.SelectedValue);
            e.NewValues["TestUserID"] = testUserID != 0 ? (int?)testUserID : null;
}

The code sets the NewValues["TestUserID"] to null, but when EF does it's stuff.. the value gets set back to the original value.

If I select a value, other than "0", the code works fine.

Any idea whats wrong?

Posted 6-Jan-11 9:13am

[DK]KiloDunse

Updated 6-Jan-11 11:12am

Henry Minute

v3

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Sandeep Mewara 6-Jan-11 15:16pm

the value gets set back to the original value -> Sure you are not rebinding the grid before the event triggers?

[DK]KiloDunse 6-Jan-11 15:18pm

It's just this value that gets returned to the original. Alle other updates fine

3 solutions

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Wild-Programmer · Answer 1 · 2011-01-06T16:53:00

Solution 1

Please try changing the column's Nullable property in the EF designer from (None) to True.

Hope that helps.

Posted 6-Jan-11 16:53pm

Wild-Programmer

[DK]KiloDunse · Answer 2 · 2011-01-06T19:40:00

Already is:

/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public Nullable<global::system.int32 xmlns:global="#unknown"> TestUserID
{
    get
    {
        return _TestUserID;
    }
    set
    {
        OnTestUserIDChanging(value);
        ReportPropertyChanging("TestUserID");
        _TestUserID = StructuralObject.SetValidValue(value);
        ReportPropertyChanged("TestUserID");
        OnTestUserIDChanged();
    }
}
private Nullable<global::system.int32> _TestUserID;
partial void OnTestUserIDChanging(Nullable<global::system.int32> value);
partial void OnTestUserIDChanged();</global::system.int32></global::system.int32></global::system.int32>

[DK]KiloDunse · Answer 3 · 2011-01-07T03:40:00

Solution 3

Found the problem.

I did not bind the property too anything in the EditItemTemplate in the gridview. Therefore, the property TestUserID did not get in the gridviews "BoundFieldValues" collection.

As a result, the property did not get updated by the EntityDataSource.

Posted 7-Jan-11 3:40am