RadGridView: Row Header Related Questions

Hello WEI TZE,

Thank you for the provided image.

RadGridView offers the RowFormatting/ViewRowFormatting and CellFormatting/ViewCellFormatting events which allow you to customize the style of the grid cells/rows. Additional information is available in the following help articles:
https://docs.telerik.com/devtools/winforms/controls/gridview/cells/formatting-cells
https://docs.telerik.com/devtools/winforms/controls/gridview/rows/formatting-rows

To customize the non-data cells/rows (header row, new row, filtering row, etc) of RadGridView, you need to handle the ViewCellFormatting/ViewRowFormatting event:
https://docs.telerik.com/devtools/winforms/controls/gridview/cells/formatting-cells#formatting-non-data-cells
https://docs.telerik.com/devtools/winforms/controls/gridview/rows/formatting-rows#customize-the-non-data-rows-appearance

In your case, you can subscribe to the ViewCellFormatting of the RadGridView. Inside the vent handler, you can check the e.CellElement property for GridRowHeaderCellElement. Then you could customize the cell per your requirement. Here you could also set the Text property of the row header cell.

private void RadGridView1_ViewCellFormatting1(object sender, CellFormattingEventArgs e)
{
    if (e.CellElement is GridRowHeaderCellElement )
    {       
        e.CellElement.Text = "C1";
        e.CellElement.ForeColor = Color.Blue;
    }
}

As for getting the text of a specific row header cell, you can use the following code.

var cellContent = this.radGridView1.TableElement.VisualRows[0].VisualCells[0].Text;

I hope that you find this information helpful.

Regards,
Dinko
Progress Telerik