How to check Windows form is already open

Suppose if we are calling a form from a menu click on MDI form, then we need to create the instance declaration of that form at top level like this:

Form1 fm = null;

Then we need to define the menu click event to call the Form1 as follows:

private void form1ToolStripMenuItem_Click(object sender, EventArgs e) {     if (fm == null|| fm.Text=="")     {         fm = new Form1();         fm.MdiParent = this;         fm.Dock = DockStyle.Fill;         fm.Show();     }     else if (CheckOpened(fm.Text))     {         fm.WindowState = FormWindowState.Normal;         fm.Dock = DockStyle.Fill;         fm.Show();         fm.Focus();     } }

The CheckOpened defined to check the Form1 is already opened or not:

private bool CheckOpened(string name) {     FormCollection fc = Application.OpenForms;     foreach (Form frm in fc)     {         if (frm.Text == name)         {             return true;         }     }     return false; }

Hope this will solve the issues on creating multiple instance of a form also getting focus to the Form1 on menu click if it is already opened or minimized.