Find the open forms in c# windows application

Question

I am using this function to close existing form and open a new form.

If there is no exixting form, it throws error.

Error :

Target : System.Object

Answer 1

if (ApplicationFormStatus.CheckIfFormIsOpen("FormName")) 
{
// It means it exists, so close the form
}

 public bool CheckIfFormIsOpen(string formname)
        {

            //FormCollection fc = Application.OpenForms;
            //foreach (Form frm in fc)
            //{
            //    if (frm.Name == formname)
            //    {
            //        return true;
            //    }
            //}
            //return false;

            bool formOpen= Application.OpenForms.Cast
().Any(form => form.Name == formname);

            return formOpen;
        }

I have pasted the two methods one simple one and the second one is the LINQ.