' Get the table from the DataGridView
Dim table As DataTable = DataGridView1.DataSource
' To Sum the column you can use a Linq query
' In this part of the query, t.Field(Of Integer), change Integer to thecorrect data type for the column to be Sum'ed
' In this part of the query, ("ColumnName"), Change the ColumnName to the name of the column being Sum'ed.
' The variable results will contain the total
Dim results = (From t In table.AsEnumerable()
Select t.Field(Of Integer)("ColumnName")).Sum(Function(t) t)
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