How to change the header cell back color in radgridview?

[tsz wai]

I want to set back color in the header cell, if  column is readonly, the header cell back color is green, else red.

I found nothing method in GridViewColumn about set style.

[Todor]

Hello,

Thank you for writing.

To format the Header cells you should use the ViewCellFormatting event:

private void radGridView1_ViewCellFormatting(object sender, Telerik.WinControls.UI.CellFormattingEventArgs e)
{
    if (e.CellElement is GridHeaderCellElement)
    {
        e.CellElement.NumberOfColors = 1;
        e.CellElement.DrawFill = true;

        if (e.Column.ReadOnly)
        {
            e.CellElement.BackColor = Color.Green;
        }
        else
        {
            e.CellElement.BackColor = Color.Red;
        }
    }
    else
    {
        e.CellElement.ResetValue(LightVisualElement.NumberOfColorsProperty, Telerik.WinControls.ValueResetFlags.Local);
        e.CellElement.ResetValue(LightVisualElement.BackColorProperty, Telerik.WinControls.ValueResetFlags.Local);
        e.CellElement.ResetValue(LightVisualElement.DrawFillProperty, Telerik.WinControls.ValueResetFlags.Local);
    }
}

More information about GridView cells formatting can be found here: Formatting Cells

I hope this helps.

Regards,
Todor
Telerik