I have a datagrid with several columns.  When trying to validate the column
by looping through each column in the collection using a subscript I need to
first determine whether the column is defined as a string or an integer.  Is
there a function that will allow me to do this?  Note that the column types
and data remain the same.  I just need to know whether the column is defined
as a string or integer to decide what validations to  do.

Example:

       Dim r As DataRow
       Dim cols As DataColumnCollection
       Dim c As DataColumn
       cols = dstable1.Tables("Table1").Columns
       
       For Each r In dstable1.Tables("Table1").Rows
           For Each c In cols
               If r(c, DataRowVersion.Current)   ??? is string or integer  
???
                        do something
           next c
       next r

thanks