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

2 votes107 views1 answer
Cursor visible unity
C#
0 vote106 views1 answer
C# sharepoint get users from column
C#
1 vote159 views1 answer
What is data encapsulation c#
C#
0 vote134 views1 answer
Unity topdown 2d look
C#
0 vote144 views2 answers
Get index of item unity
C#
1 vote135 views1 answer
Iactionresult
C#
6 votes134 views1 answer
Unity access child
C#
0 vote134 views1 answer
Kill System Process in C#
C#
1 vote162 views1 answer
C# copy an object
C#
2 votes129 views2 answers
C# matrix
C#