ASP.NET - Guardar datos de varios radiobuttonlist que estan dentro de un gridview en sqlserver

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

    ' Dim sql As GridView = DirectCast(SqlDataSource.Select(DataSourceSelectArguments.Empty), GridView)}

    For Each gvr As GridViewRow In GridView1.Rows

        Dim rd As RadioButtonList = CType(gvr.FindControl("radioButtonGender"), RadioButtonList)

    Next

    'SqlDataSource.Insert()

End Sub