Grid View for ASP.NET Web Forms - How to create ShowBlanksValue and ShowNonBlanksValue items in the header filter

GridViewDataComboBoxColumn does not render (Blank) and (NonBlank) items if the HeaderFilterMode property is set to CheckedList. Call the FilterValue.CreateShowBlanksValue and FilterValue.CreateShowNonBlanksValue methods in the HeaderFilterFillItems event handler to add these items.

protected void grid_HeaderFilterFillItems(object sender, ASPxGridViewHeaderFilterEventArgs e) {
    if (e.Column.FieldName != "CategoryNameNull")
        return;
    e.Values.Insert(0, FilterValue.CreateShowBlanksValue(e.Column, "Blanks"));
    e.Values.Insert(1, FilterValue.CreateShowNonBlanksValue(e.Column, "Non Blanks"));
}

Files to Review

• Default.aspx (VB: Default.aspx)
• Default.aspx.cs (VB: Default.aspx.vb)

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