winform - merging datagridview headers

Question

I have a problem with merge the datagridview headers in winForm.

I using this code :

void dataGridView1_Paint(object sender, PaintEventArgs e)
    {
               


        

Answer 1

I believe the easiest way would be to invalidate merged header's cells every time the datagridview is scrolled. You would need to add a handler to the Scroll event:

dataGridView1.Scroll += new System.Windows.Forms.ScrollEventHandler(this.dataGridView1_Scroll);

Below is scroll event handler implementation:

private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
{
    Rectangle rect = Rectangle.Union(
        dataGridView1.GetCellDisplayRectangle(2, -1, true), 
        dataGridView1.GetCellDisplayRectangle(3, -1, true));
    dataGridView1.Invalidate(rect);
}

hope this helps, regards