border issue in column headers

Question

InitializeComponent();

            this.EnableHeadersVisualStyles = false;
            this.ColumnHeadersDefaultCellStyle.Font = new Font("Tahoma", 9.75F, FontStyle.Bold); // HEADER FONT BOLD 
           this..CellBorderStyle = DataGridViewCellBorderStyle.None;
            this.ColumnHeadersDefaultCellStyle.BackColor = Color.FromArgb(250, 243, 198); // change back color of header cells

  protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)
        {
            if (e.RowIndex == -1 && e.ColumnIndex > -1)
            {
                // REMOVE COMPLETE CELL DIVISION AND CHANGE BACK COLOR 
                e.Handled = true;
                using (Brush b = new SolidBrush(this.ColumnHeadersDefaultCellStyle.BackColor))
                {
                    e.Graphics.FillRectangle(b, e.CellBounds);
                }
                e.PaintContent(e.ClipBounds);

                e.PaintBackground(e.CellBounds, true);
                Rectangle r = e.CellBounds;
                r.X -= 2;

                // Check if it's the first column
                if (e.ColumnIndex == 0)
                { // Adjust the padding for the first column
                    r.X += 4;

                    // Align the text to the right for the first column
                    TextRenderer.DrawText(e.Graphics, this.Columns[e.ColumnIndex].HeaderText, e.CellStyle.Font, r, e.CellStyle.ForeColor, TextFormatFlags.Right | TextFormatFlags.VerticalCenter);
                }
                else
                {
                    // Align the text to the left for other columns
                    TextRenderer.DrawText(e.Graphics, this.Columns[e.ColumnIndex].HeaderText, e.CellStyle.Font, r, e.CellStyle.ForeColor, TextFormatFlags.Left | TextFormatFlags.VerticalCenter);
                }



                // Draw top double border
                int topBorderThickness = 3; // Set the thickness of the top border
                int bottomBorderThickness = 1; // Set the thickness of the bottom border
                int x = e.CellBounds.Left;
                int yTop = e.CellBounds.Top;
                int yBottom = e.CellBounds.Bottom - bottomBorderThickness;
                int width = e.CellBounds.Width;
                using (Pen topBorderPen = new Pen(Color.Black, topBorderThickness))
                using (Pen bottomBorderPen = new Pen(Color.Black, bottomBorderThickness))
                {
                    // Draw top border
                    e.Graphics.DrawLine(topBorderPen, x, yTop, x + width, yTop);
                    // Draw bottom border
                    e.Graphics.DrawLine(bottomBorderPen, x, yBottom, x + width, yBottom);
                }
            }
        }

the above code i am using inside datagridview , asked by some other user here in microsoft a nd a , and modified by me according to my requirement . but the above logic is not working properly . i can see that there is some border visible between the columns division .

Thanks in advance

Answer 1

Hi @Shaifali jain , Welcome to Microsoft Q&A,

There is a direct property to operate on for your requirement.

ColumnHeadersBorderStyle

this.ColumnHeadersBorderStyle = DataGridViewHeaderBorderStyle.None;

Best Regards,

Jiale

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