104 105 } // end class FrmMaximum 106 }



 int intValue2 = 5;



 private void btnEnter_Click(

 object sender, System.EventArgs e )



 { int intValue1 = 10;

 int intValue2 = 3;



 Test( ref intValue1 );



 lblDisplay.Text = Convert.ToString( intValue1 );



 } // end method btnEnter_Click



 void Test( ref int intValue1 )

 {

 intValue1 *= intValue2;



 } // end method Test

Label lblDisplay displays the value of variable intValue1 (50). When the code

invokes the method Test, it passes intValue1 pass-by-reference. Any changes made to intValue1 in the method Test are reflected in btnEnter_Click’s local variable intValue1. When method Test multiplies intValue1 by intValue2, intValue2 is the class instance variable, whose value is 5. Method Test does not have access to btnEnter_Click’s local variable intValue2. The complete code reads:




 // ScopeTest.cs





 using System;


 using System.Drawing;


 using System.Collections;


 using System.ComponentModel;


 using System.Windows.Forms;


 using System.Data;





 namespace ScopeTest


 {


 /// 


 /// Summary description for FrmScopeTest.


 /// 



 public class FrmScopeTest : System.Windows.Forms.Form


 {


 private System.Windows.Forms.Button btnEnter;


 private System.Windows.Forms.Label lblDisplay;


 private System.Windows.Forms.Label lblResult;


 /// 


 /// Required designer variable.


 /// 



 private System.ComponentModel.Container components = null;











 public FrmScopeTest()


 {


 //


 // Required for Windows Form Designer support


 //


 InitializeComponent();





 //


 // TODO: Add any constructor code after InitializeComponent


 // call


 //


 }





 /// 


 /// Clean up any resources being used.


 /// 



 protected override void Dispose( bool disposing )


 {


 if( disposing )


 {


 if (components != null)


 {


 components.Dispose();


 }


 }


 base.Dispose( disposing );


 }





 // Windows Form Designer generated code





 /// 


 /// The main entry point for the application.


 /// 



 [STAThread]


 static void Main()


 {


 Application.Run( new FrmScopeTest() );


 }





 // performs calculations with variables of different scopes


 [STAThread]


 static void Main()


 {


 Application.Run( new FrmScopeTest() );


 }





 // performs calculations with variables of different scopes


private void btnEnter_Click(


object sender, System.EventArgs e )


{


int intValue1 = 10;


int intValue2 = 3;


Test( ref intValue1 );


lblDisplay.Text = Convert.ToString( intValue1 );


} // end method btnEnter_Click


 // multiplies two variables


void Test( ref int intValue1 )


{


intValue1 *= intValue2;


} // end method Test


 } // end class FrmScopeTest


 }