Question

I’m trying save the print screen with the code below but it doesn’ t work

 private void button3_Click(object sender, EventArgs e)
    {

        SaveFileDialog saveFileDialog1 = new SaveFileDialog();
        if (saveFileDialog1.ShowDialog() == DialogResult.OK)
        {
            button1.Visible = false;
            button2.Visible = false;
            Bitmap bitmap = new Bitmap(this.Width, this.Height);
            this.DrawToBitmap(bitmap, this.ClientRectangle);
            bitmap.Save("myPrintScreen.bmp");
            button1.Visible = true;
            button2.Visible = true;
        }

    }

Answer 1

Use a SaveFileDialog

 SaveFileDialog saveFileDialog1 = new SaveFileDialog();
 if(saveFileDialog1.ShowDialog() == DialogResult.OK)
 {
     // Save file, use saveFileDialog1.FileName
 }

You can set the filename with the Filename Property. For your example:

saveFileDialog1.FileName = "myPrintScreen.bmp";

[Edit after question edit]
Change

this.DrawToBitmap(bitmap, this.ClientRectangle);

to:

using(var Stream = saveFileDialog1.OpenFile())
{
    bitmap.Save(Stream , ImageFormat.Bmp);
}