VB.Net - Trying to Set DataSet DataRelations

Good Day Experts!

I am trying to setup a DataSet with two DataTables and a DataRelations.  Unfortunately I am getting an error that I cannot seem to rid the error.

Here is my code:

                            Dim tblTargetPriKey(1) As DataColumn
                            Dim tblTarget2PriKey(1) As DataColumn
                            tblTargetPriKey(1) = tblTarget.Columns("col2")
                            tblTarget2PriKey(1) = tblTarget2.Columns("Pro Number")
                            tblTarget.PrimaryKey = tblTargetPriKey
                            tblTarget2.PrimaryKey = tblTarget2PriKey
                            Dim TargetParent As DataColumn
                            Dim Target2Child As DataColumn
                            TargetParent = TargetDataSet.Tables("tblTarget").Columns("col2")
                            Target2Child = TargetDataSet.Tables("tblTarget2").Columns("Pro Number")
                            Dim tblTargetRelation As DataRelation
                            tblTargetRelation = New DataRelation("Relations", TargetParent, Target2Child)

Error is on line:

TargetParent = TargetDataSet.Tables("tblTarget").Columns("col2")

Error text:

System.NullReferenceException was unhandled
  Message="Object reference not set to an instance of an object."

I have searched the net and cannot figure out what I need to do to repair. Do you have any ideas?

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Éric MoreauSenior .Net ConsultantCommented:
can you try:
TargetParent = TargetDataSet.Tables(0).Columns("col2")

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Jimbo99999Author Commented:
It worked!

Thanks...I wonder the reasoning?

Éric MoreauSenior .Net ConsultantCommented:
You just didn't set the TableName of each of your tables so you need to reference them by their position

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Jimbo99999Author Commented:
Excellent...I understand now.  I appreciate the help.
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