Hello :
Is there any way to send the control's name as a parameter variable in this code line?

some as this :

VarNameControl_SelectByUser="TextBox3"

var vv =  Controls.Cast<Control>().Single(x => x.Name ==VarNameControlSelectByUser)
vv.BackColor = Color.Azure

VarNameControlSelectByUser is a string variable contained the name of control.
(The code above is only for question purpose and do not run fine.)