conversion of breckets

when convert datatable row index its not convert() to [

for example

vb.net

 If ViewState("grvTitleDt_Del") IsNot Nothing Then dtDel = CType(ViewState("grvTitleDt_Del"), DataTable)

c#.net:-

if (ViewState("grvTitleDt_Del") != null)
    dtDel = (DataTable)ViewState("grvTitleDt_Del");

it should be:-

if (ViewState["grvTitleDt_Del"] != null)
    dtDel = (DataTable)ViewState["grvTitleDt_Del"];