C#

DataGridView grid = new DataGridView();

foreach(string colName in ColumnNames)
{
    grid.Columns.Add(
            ([condition]) ?
                new DataGridViewColumn() :
                new MyColumn());
} 

protected void OnPrintPage(object sender, PrintPageEventArgs e)
{
    int res = 3;
    float mmToInches = 1.0f / 25.4f;
    int width = (int)(LabelSettings.Width * mmToInches);
    int height = (int)(LabelSettings.Height * mmToInches); 
    
    Bitmap bitmap = new Bitmap(1,1);
    Artist = Graphics.FromImage(bitmap);
    int bitMapDpiX = (int) Artist.DpiX; // 96
    int bitMapDpiY = (int) Artist.DpiY; // 96
    Artist.Dispose();

    bitmap = new Bitmap(width * (int) e.Graphics.DpiX, height * (int) e.Graphics.DpiY);
    //bitmap.SetResolution((int)e.Graphics.DpiX, (int)e.Graphics.DpiY);

    Artist = Graphics.FromImage(bitmap);
    DrawLabel(); // Graphics.DrawXYZ()...
    Artist.Dispose();

    e.Graphics.DrawImage(bitmap, 0, 0);
    e.HasMorePages = false;
}

David935 wrote:

Bitmap bitmap = new Bitmap(1,1);
Artist = Graphics.FromImage(bitmap);
int bitMapDpiX = (int) Artist.DpiX; // 96
int bitMapDpiY = (int) Artist.DpiY; // 96

David935 wrote:

Artist = Graphics.FromImage(bitmap);
DrawLabel(); // Graphics.DrawXYZ()...
Artist.Dispose();

David935 wrote:

Should I be setting the PageUnits

bitmap = new Bitmap(width * (int) e.Graphics.DpiX, height * (int) e.Graphics.DpiY);

bitmap.SetResolution(bitMapDpiX, bitMapDpiY);

bitmap = new Bitmap(width * (int) e.Graphics.DpiX * 2, height * (int) e.Graphics.DpiY * 2);

bitmap.SetResolution(bitMapDpiX * 2, bitMapDpiY * 2);

David935 wrote:

Doing so makes the resulting image significantly smaller.

protected void OnPrintPage(object sender, PrintPageEventArgs e) {
    float mmPerInch = 25.4f;
	// size in printer pixels
    int width = (int)(LabelSettings.Width * e.Graphics.DpiX / mmPerInch);
    int height = (int)(LabelSettings.Height * e.Graphics.DpiY / mmPerInch);
    Console.WriteLine("width="+width+"  heigth="+height);
    
    bitmap = new Bitmap(width, height);
    using (Artist = Graphics.FromImage(bitmap)) {
        DrawLabel(Artist, width, height);
    }

    e.Graphics.DrawImage(bitmap, 0, 0);
    bitmap.Dispose();
    e.HasMorePages = false;
}

Font font=new Font("Arial", 14);
Brush brush=new SolidBrush(Color.Black);

protected void DrawLabel(Graphics g, int width, int heigth) {
	g.DrawRectangle(Pen.Black, 1, 1, width-2, height-2);
	g.DrawString("Test font quality", font, brush, 3, 3);
}