Handling "Column does not belong to table" Exception

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.NET

If System.IO.File.Exists(strPathName & "_Master.xml") Then
            dsMaster.ReadXml(strPathName & "_Master.xml")
        Else
            MessageBox.Show("Master does not exist")

        End If
            Dim rowMaster() As DataRow = dsMaster.Tables(0).Select("FinYearID=" & GlobalClass.finYearId & " And MemType='" & GlobalClass.MemType & "' And MemberID='" & rowTran("MemberID") & "'")

Dim strBuilder As New StringBuilder
            strBuilder.AppendLine("<?xml version='1.0' encoding='utf-8'?>")
            'declare the start root.
            strBuilder.AppendLine("<ReportInfo>")
            strBuilder.Append("<Info>")

 strBuilder.Append("<Email>")
            Try
                strBuilder.Append(rowMaster(0)("Email") & "") ' to test if there is any "Email" column in master table or not ?
            Catch ex As Exception
                strBuilder.Append("")
            End Try
            strBuilder.Append("</Email>")

  strBuilder.Append("</Info>")
            'declare the end root.
            strBuilder.AppendLine("</ReportInfo>")

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I am using the above code to make an xml file.
I am reading the data from an xml file named "master".
In master file there is some tag missing e.g. <email> tag, so when I read email tag it gives me "Column does not belong to table" Exception.

I can handle this exception with try-catch block, but I want to know if there is any way to handle it with if-else statement, like 'isDBNull' or 'is Not Nothing'.

Please tell me if anyone knows...
I will be very thankful to him/her.