How to erase Textboxes Controls With Same Basename???

Question

i want to go through controls with almos the same name, TextBox1, TextBox2, TextBox3 & TextBox4.

 

i want to make a 'while' to erase the txtboxes and as the base name is the same (TextBox)  i need just a number at the end of the string and convert the string in a TextBox Control. something like this:

 

while (n < 4)

{

   string _strTXT = "TextBox";

   (_strTXT+n).Text=null;

    n++;

}