Prevent Multiple Instances for Windows Forms in .NET

This is to Prevent Multiple Instances for a Particular Form in a Windows Application.

This is to Prevent Multiple Instances for a Particular Form in a Windows Application.

bool IsOpen = false; Form1 Frm = new Form1();

if (Application.OpenForms["Form1"] != null)

{

if (Application.OpenForms["Form1"].Text == "Your Form Text")

{

IsOpen = true;

}

if (IsOpen == true)

{

Frm.Focus();

}

}

else

{

IsOpen = true;

Frm.Show();

Frm.Focus();

}

or try this simple code,

Form1 Frm = new Form1();

Frm.ShowDialog(this);