What you could do is add DataKeyNames to the GridView and set your table column names in there i.e.
<asp:GridView ID="GridView1" runat="server"
DataKeyNames="PNR,Credit Card Number,Email Address,Passenger Name,Passport Number,IP Number">
And in your GridView1_RowDeleting you'll be able to build a query like this...
Dim strSql As String = String.Format("DELETE FROM myTable WHERE PNR = {0}, CreditCardNumber {1}, EmalAddress = {2}, PassengerName = {3}, PassportNumber = {4}, IPNumber = {5}", GridView1.DataKeys(e.RowIndex)("PNR"), GridView1.DataKeys(e.RowIndex)("Credit Card Number"), GridView1.DataKeys(e.RowIndex)("Email Address"), GridView1.DataKeys(e.RowIndex)("Passenger Name"), GridView1.DataKeys(e.RowIndex)("Passport Number"), GridView1.DataKeys(e.RowIndex)("IP Number"))