C# reopen form if open

// Look through all open forms to see if there is already a Form2 open.
// If it is, Close it. This prevents the user from (purposely) having 5 of the same forms open.
// If you try to cycle through open forms after closing one, it crashes, 
//     because it edits the list of forms while cycling through it
// This is why it is converted into a list of forms first.
foreach (Form frm in Application.OpenForms.Cast<Form>().ToList())
{
    if (frm.Name == "Form2")
    {
        frm.Close();
    }
}

Similar codes

11 votes102 views2 answers
C# array to string
C#
4 votes91 views2 answers
Degree to radians c#
C#
0 vote107 views1 answer
How to call last string from text file C#
C#
6 votes103 views1 answer
Callback function on animation end unity
C#
0 vote89 views1 answer
Unity error log
C#
7 votes297 views2 answers
Scaffold-dbcontext sql server
C#
0 vote94 views1 answer
What is the best way to lock cache in asp.net?
C#
6 votes93 views3 answers
#region in c#
C#
0 vote106 views1 answer
Dapper c# insert range
C#
0 vote108 views1 answer
How to detach the camera from the player after death unity
C#