Determine Whether or Not a Form Is Open

Determine Whether or Not a Form Is Open

Sometimes in the myriad of forms, it can become quite difficult figuring out whether or not a form has already been loaded and if is still open or not. To determine if a form has already been loaded into memory, you can use the following procedure that makes use of LINQ which queries the Applicaction.OpenForms collection:

private void CheckForms()        {            var frm = Application.OpenForms.Cast().Where(x = x.Name == "Form1").FirstOrDefault();            if (null != frm)            {                frm.Show();                frm.Activate();                frm.BringToFront();            }            else            {                Form1 frm = new Form1;                frm.Show();                frm.Activate();                frm.BringToFront();            }                        }

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