Thanks! I combined your code with mine and got just what I needed. Here's what I ended up with: private void button3_Click(object sender, System.EventArgs e) { System.Drawing.Font currentFont= listBox1.Font; FontStyle fs= currentFont.Style; float fontsize = this.listBox1.Font.Size; fontsize++; if (fontsize > 20) { fontsize = 8; } listBox1.Font = new Font(currentFont.FontFamily, fontsize, fs); } Gandalf
