Erase default rectangle and create new rectangle in c# windows applica

Question

how to erase default or old drawn rectangle and create new rectangle in c# windows application when i click on reset button clears textboxes simelteniously clear draw rectangle

Sachin Singh · Answer

public partial class Form2 : Form { public Form2() { InitializeComponent(); } Rectangle rectangle1; Pen pen1; int x = 10, y = 20, w = 100, z = 200; string whatToDraw=null; private void button1_Click(object sender, EventArgs e) // draw rectangle with dialog yes/no { MessageBoxButtons buttons = MessageBoxButtons.YesNo; DialogResult result = MessageBox.Show( "yes/no" , "what" , buttons); if (result == DialogResult.Yes) { rectangle1 = new Rectangle(x, y, w, z); whatToDraw = "Rectangle" ; //this.Invalidate(); panel1.Invalidate(); } else { rectangle1 = new Rectangle(1, 1, 699, 699); whatToDraw = "Rectangle" ; panel1.Invalidate(); } } private void button3_Click(object sender, EventArgs e) // draw tringle { whatToDraw = "Triangle" ; panel1.Invalidate(); } private void panel1_Paint(object sender, PaintEventArgs e) // all shapes { switch (whatToDraw) { case "Rectangle" : e.Graphics.DrawRectangle(Pens.Black, rectangle1); break ; case "Triangle" : Point p1= new Point(100,500); Point p2= new Point(10,300); Point p3= new Point(60,500); Point[] points= {p1,p2,p3}; e.Graphics.DrawPolygon(Pens.Black, points); break ; default : Console.WriteLine( "No match found" ); break ; } } // shapes to draw inside panel private void button2_Click(object sender, EventArgs e) { whatToDraw = null; panel1.Invalidate(); } // clear panel }