How to draw widthwise and height wise when i click button

Question

hi,

i have label1 ,label2 and textbox1,textbox2

 

label1.back color is Black.

label2.back color is White.

 

i want if i enter text in textbox1 like

 

10-A

3-B

and textbox2

10-A

3-B

 

here A = Label1.Back color i.e Black

Here B = Label2.back color.i.e White

 

Now,i want to click button or Mouse click on picturebox event draw Like Picture uploaded below

 

 

 

this below code is only for refrence idea

private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics gForm = this.CreateGraphics();
gForm.FillRectangle(Brushes.Black, this.ClientRectangle);
for (int i = 1; i <= 100; ++i)
{
Rectangle r = new Rectangle(i * 40 - 15, 0, 15,
this.ClientRectangle.Height);
//Rectangle r = new Rectangle(i * 40 - 15, 0, 15, this.ClientRectangle.Width);
gForm.FillRectangle(Brushes.Gray, r);
}
}

Please Help with source code