如何将此VB.NET语句转换为C#语句?????

Dim Ctrl As Control
        Dim txt As System.Windows.Forms.TextBox
        For Each Ctrl In Controls
            If TypeOf (Ctrl) Is System.Windows.Forms.TextBox Then
                txt = CType(Ctrl, System.Windows.Forms.TextBox)
                txt.Text = ""
            End If
        Next

答案：Control Ctrl;
System.Windows.Forms.TextBox txt ;
Foreach(Control ctrl in this.Controls)
 if(ctrl is System.Windows.Forms.TextBox)
 {
  txt=(System.Windows.Forms.TextBox)ctrl;
  txt.Text = "" ;
  }

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