close all open forms that formBorderStyle is None

for (var i = Application.OpenForms.Count - 1; i >= 0;i-- )
{
    var f = Application.OpenForms[i];
    if (f.Name != "frmMain" && f.FormBorderStyle == System.Windows.Forms.FormBorderStyle.None)
    {
        f.Close();
        //break;
    }
}

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Muthukrishnan Ramasamy

net4.rmkrishnan.net

Use only what you need, Reduce global warming