Question

Form1 frm = new Form1();
frm.mdiParent=this;
frm.show();

I want to create a global method showFrm(Form formToShow) which i can access from anywhere in my project.

I’ve tried.

public void showFrm(Form formToShow)
{
    formToShow f=new formToShow();//getting error here
    f.mdiParent= mdiForm;
    f.show();
}

Answer 1

Put this method in your “only parent form” class:

public void ShowMdiChild<T>() where T: Form, new()
{
    var form = new T();
    form.MdiParent = this;
    form.Show();
}

Usage:

yourOnlyParentForm.ShowMdiChild<SomeForm>();

I would also remind you that C# is case-sensitive.