Cs close opened form when reopened

// 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

1 vote331 views1 answer
Asp net c# compare date to current
C#
4 votes360 views1 answer
Unity move left and right
C#
2 votes354 views2 answers
Linq select
C#
0 vote367 views1 answer
Why Duplicate "..TargetFrameworkAttribute" c# assemblies created
C#
3 votes370 views2 answers
.net c# print object
C#
-1 vote372 views2 answers
Error CS1513: } expected but there is already unity
C#Unity
11 votes332 views1 answer
Random() C# grepper
C#
0 vote381 views1 answer
C# signalr console app server example
C#
0 vote358 views1 answer
Design pattern for so many conditions c#
C#
2 votes348 views2 answers
C# color hex
C#