Clear Text Boxes

Hi, I want to clear the content of a group of TextBoxes at one shot. I have the below textboxes

TextBox1
TextBox2
TextBox3
TextBox4
TextBox5
TextBox6
TextBox7
TextBox8
TextBox9
TextBox10
TextBox11
TextBox12

and I want to clear TextBox values from TextBox4 to TextBox9. Something like 'for loop 4-9' or any other way related.