Border not visible in datagridview

Question

i have a custom datagridview with the following declaration

    
   private void uneditabledatagridview_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
        {
            if (e.RowIndex == -1 && e.ColumnIndex > -1)
            {
                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.Left | 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.Right | 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);
                }
                e.Handled = true;
            }
        }

it effects in this

the column header has a thick border on the upper side and slightly thin border on the bottom side . . but when the added this

        protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)
        {
            if (e.RowIndex == -1 && e.ColumnIndex > -1)
            {
                e.Handled = true;
                using (Brush b = new SolidBrush(this.DefaultCellStyle.BackColor))
                {
                    e.Graphics.FillRectangle(b, e.CellBounds);
                }
                e.PaintContent(e.ClipBounds);
            }
        }

to completely remove the header divisions between the cells , the header cells border goes

so i am trying to have the both effects on the header cells . can you pls suggest what to do

effect 1 : thick border on the upper and thin border on the bottom

effect 2 : completely remove the header cell division

the project is on

https://github.com/Vijaykumar4567/Vijaykumarproject

the related files are

1. balancesheet.cs which is inside childforms folder
2. uneditabledatagridview.cs which is inside supercontrols folder

Answer 1

Hi @vijay kumar , Welcome to Microsoft Q&A,

You only need to delete the uneditabledatagridview_CellPainting event, and put the corresponding online and offline codes in the OncelPainting event.

The original code doesn't work because you draw the rectangle again.

protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)
{
	if(e.RowIndex == -1 && e.ColumnIndex > -1)
	{
		e.Handled = true;
		using(Brush b = new SolidBrush(this.DefaultCellStyle.BackColor))
		{
			e.Graphics.FillRectangle(b, e.CellBounds);
		}
		e.PaintContent(e.ClipBounds);
		// 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);
		}
	}
}

Best Regards,

Jiale

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