Comments - Do you add a comment when you use Thread.Sleep?

First don’t do it and find the right fix. But if you have to, it should always be commented – as though your life depended on it.

public DialogResult RefreshSchema() {
    SSW.SQLAuditor.WindowsUI.QueryAnalysisForm.RunScript(Startup.PageQueryAnalyzer.txtScript.Text)
    System.Windows.Forms.Application.DoEvents()
    // This is a sleep to delay the Application.DoEvent process.
    System.Threading.Thread.Sleep(500)
    System.Windows.Forms.Application.DoEvents()
    ...
}