in C# how to extract data from datagrid control in edit mode

Question

IN C#

 how to extarct data from datagrid control for updatig  if we place edit button on each column ... update and cancel links in each columns
so for updating each column values how to extract from tablecell

i know in VB  but not in C#
dim s as string
s=ctype(e.item.cells[0],tablecell).text
but how in C# ctype not worked

please give reply