How to format a control like a variable?

Question

How to format a control like a variable?

For example; 

 

// Create a method 

 Control MyControls(TextBox control)

{

      //Your codes... 

} 

 

//Adding many textbox as parameter in a method 

for( i=0;i<10;i++)

{

    MyControls( textbox{i} );

} 

 

Thanks all attention