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public static void Main() 

Console.WriteLine(Foo(30)); 

public static int Foo(int i) 

if (i <= 0) 
return 0; 
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return 1; 
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{
if (control is System.Windows.Forms.TextBox)
{
System.Windows.Forms.TextBox tb = (System.Windows.Forms.TextBox)control ; 
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}
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;
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{
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