How to Get the gridview cell value of the selected row into a datatable

I got a gridview in which i selected a row by clicking anywhere on the row and now i am trying to get a cell value of the selected row into a datatable.

I am getting an error saying " Input string was not in a correct format. " at the point given below (at ---->)

Private Sub CreateSelectionAsSessionTable()
        Dim dt As New DataTable
        Dim drow As DataRow

        dt.Columns.Add(New DataColumn("PremiseId", GetType(Integer)))
        dt.Columns.Add(New DataColumn("CustomerId", GetType(Integer)))
        dt.Columns.Add(New DataColumn("Addressline1", GetType(String)))
        dt.Columns.Add(New DataColumn("Name1", GetType(String)))
        dt.Columns.Add(New DataColumn("HomePhoneNumber", GetType(String)))
        dt.Columns.Add(New DataColumn("WorkPhoneNumber", GetType(String)))

        drow = dt.NewRow()

        Dim i As Integer = gvSelectAddress.SelectedIndex

        If i = -1 Then i = 1

   ----->     drow("PremiseId") = CType(gvSelectAddress.SelectedRow.Cells(2).Text, Integer)
        drow("addressline1") = gvSelectAddress.Rows(i).Cells(7).Text
        drow("name1") = gvSelectAddress.Rows(i).Cells(8).Text
        drow("HomePhoneNumber") = gvSelectAddress.Rows(i).Cells(9).Text
        drow("WorkPhoneNumber") = gvSelectAddress.Rows(i).Cells(10).Text

        dt.Rows.Add(drow)

        Sessions.SelectedDataTable = dt

    End Sub

Can anyone help me with this

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