I have 5 textboxes and a button which once clicked I would like it to check textbox1.text and if there is the value "11" in it then change it to 1.

Once clicked again if there is the value "11" in textbox2.text also change it to 1

Once clicked again check textbox3.text if it has "11" change it to 1

Once clicked again check textbox4.text if it has "11" change it to 1

so on so forth

Thanks in advance