Textboxes To SharePoint List!

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C#

SharePoint

SPWeb web = SPContext.Current.Web;
            SPList list = web.Lists["MyList"];
            SPListItem item = list.Items[0];

            item["Title"] = TextBox_Name.Text;

            item.SystemUpdate(false);
            list.Update(); 

i have writted following code , that takes column on place 0 and replace in with the value i write in the first textboxes the next step is to do it with 5 textboxes more , can somebody help me =? i have tried with [1] and so one but i dont work, can somebody help me ?