For that you have set form's FormBorderStyle Property to None.
this.FormBorderStyle
= System.Windows.Forms.FormBorderStyle.None;
you can write this in Form_load Event:
private
void Form1_Load(object
sender, EventArgs e)
{
this.FormBorderStyle
= System.Windows.Forms.FormBorderStyle.None;
}
but when you make border less form , then it is impossible to close window ,
because close button is not visible at that time.
For that you have to add close button in your application.
So Form can be closed.
you can close Form using this:
private
void button1_Click(object
sender, EventArgs e)
{
this.Close();
}