Set ClientSize to change the form window size

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class AutoScaleDemo: Form
{
     public static void Main()
     {
          Application.Run(new AutoScaleDemo());
     }
     public AutoScaleDemo()
     {
          Font = new Font("Arial", 12);
          FormBorderStyle = FormBorderStyle.FixedSingle;
   
          int[] aiPointSize = { 8, 12, 16, 24, 32 };
   
          for (int i = 0; i < aiPointSize.Length; i++)
          {
               Button btn    = new Button();
               btn.Parent    = this;
               btn.Text      = "Use " + aiPointSize[i] + "-point font";
               btn.Tag       = aiPointSize[i];
               btn.Location  = new Point(4, 16 + 24 * i);
               btn.Size      = new Size(80, 16);
               btn.Click    += new EventHandler(ButtonOnClick);
          }
          ClientSize = new Size(88, 16 + 24 * aiPointSize.Length);
          AutoScaleBaseSize = new Size(4, 8);
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          pea.Graphics.DrawString(Text, Font, new SolidBrush(ForeColor), 0, 0);
     }
     void ButtonOnClick(object obj, EventArgs ea)
     {
          Button btn = (Button) obj;
   
          SizeF sizefOld = GetAutoScaleSize(Font);
          Font = new Font(Font.FontFamily, (int) btn.Tag);
          SizeF sizefNew = GetAutoScaleSize(Font);
   
          Scale(sizefNew.Width  / sizefOld.Width,sizefNew.Height / sizefOld.Height);
     }
}

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Set ClientSize to change the form window size : Form Frame Window « GUI Windows Form « C# / C Sharp

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