How to avoid multiple instances of windows form in c#
implement the Singleton pattern
an example: CodeProject: Simple Singleton Forms (ok, it's in VB.NET, but just to give you a clue)
Yes, it has singleton pattern,
Code to create a singleton object,
public partial class Form2 : Form
{
.....
private static Form2 inst;
public static Form2 GetForm
{
get
{
if (inst == null || inst.IsDisposed)
inst = new Form2();
return inst;
}
}
....
}
Invoke/Show this form,
Form2.GetForm.Show();
When you display the dialog simply use .ShowDialog();
instead of .Show();