get multiple checkbox checked value in c#

In my web form I am generating multiple checkboxes dynamically. hence they are not in the control. I am trying to get the value using Request.Form[name] but it is not correct

<input type="checkbox" name="Suppresision" value="Suppresision" />Suppresision

Now I have a add button which dynamically (using Javascript) add more similar checkbox. So within my table element now I have

 <input type="checkbox" name="Suppresision" value="Suppresision" />Suppresision
 <input type="checkbox" name="Suppresision" value="Suppresision" />Suppresision
 <input type="checkbox" name="Suppresision" value="Suppresision" />Suppresision

How do I try to get the values of all three ? I am doing the same for textbox but when I use Request.Form[textbox name] I get a comma separated values of all of them. But for the checkbox I do Request.Form["Suppresision"] I only get one value that too Suppresision instead of checked or not checked.How do I get all three value even if it not checked