drow a rectangle round a textbox

Question

hello. how can i drow a rectangle round a textbox when it selected in run time ?

Vulpes · Answer

You'll need to handle the TextBox's Enter and Leave events as follows: private void textBox1_Enter(object sender EventArgs e) { Rectangle rect = textBox1.ClientRectangle; rect.Inflate(new Size(10 10)); Graphics g = this.CreateGraphics(); g.DrawRectangle(Pens.Red textBox1.Left - 10 textBox1.Top - 10 rect.Width rect.Height); g.Dispose(); } private void textBox1_Leave(object sender EventArgs e) { Rectangle rect = textBox1.ClientRectangle; rect.Inflate(new Size(10 10)); Graphics g = this.CreateGraphics(); Pen p = new Pen(this.BackColor); g.DrawRectangle(p textBox1.Left - 10 textBox1.Top - 10 rect.Width rect.Height); p.Dispose(); g.Dispose(); }