failed to enable constrains.One or more rows contain value violating non-null,unique,

Hi Everyone:
I am trying to print my voucher data but its giving above mentioned error.I am very new in this field and tried several time to solved but failed.If any one can help me i will be thankful. Here is my code:

Code:

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Try
            Cursor = Cursors.WaitCursor
            Timer1.Enabled = True
            Dim rpt As New rptVoucher
            Dim myConnection As SqlConnection
            Dim MyCommand As New SqlCommand()
            Dim myDA As New SqlDataAdapter()
            Dim myDS As New DataSet3
            myConnection = New SqlConnection(cs)
            MyCommand.Connection = myConnection
            MyCommand.CommandText = "SELECT Pettycash.ID, Pettycash.Pettycashno,Pettycash.Date, Pettycash.Accountno, Pettycash.Accountname, Pettycash.Amount, Pettycash_Details.VD_ID,Pettycash_Details.Accountname, Pettycash_Details.AccountNo, Pettycash_Details.Billref, Pettycash_Details.Narration, Pettycash_Details.Amount FROM Pettycash INNER JOIN Pettycash_Details ON Pettycash.ID = Pettycash_Details.VoucherID  where Pettycashno='" & txtVoucherNo.Text & "'"
            MyCommand.CommandType = CommandType.Text
            myDA.SelectCommand = MyCommand
            myDA.Fill(myDS, "Pettycash")
            myDA.Fill(myDS, "Pettycash_Details")
            rpt.SetDataSource(myDS)
            frmReport.CrystalReportViewer1.ReportSource = rpt
            frmReport.ShowDialog()
        Catch ex As Exception
            MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try

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Attachment 179030
Attachment 179031

As I commented on Stack Overflow, why are you executing the same query twice to populate two different DataTables? Either you want all the data in one DataTable, in which case you execute the query once, or you want it in two DataTables, in which case you execute two different queries with no join.

Also, what's up with this:

Code:

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Dim myDS As New DataSet3

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What is a DataSet3 is that a typed DataSet? If so, why are you creating all your own ADO.NET objects instead of using table adapters?

Quote:

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Originally Posted by jmcilhinney

Also, what's up with this:

Code:

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Dim myDS As New DataSet3

---

What is a DataSet3 is that a typed DataSet? If so, why are you creating all your own ADO.NET objects instead of using table adapters?

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Hi Sir,

Yes DataSet3 is my DataSet

Quote:

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Originally Posted by jmcilhinney

As I commented on Stack Overflow, why are you executing the same query twice to populate two different DataTables? Either you want all the data in one DataTable, in which case you execute the query once, or you want it in two DataTables, in which case you execute two different queries with no join.

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Hi Sir,

Actually i want it to in Two DataTables but i don't know how to execute two different queries with no join.Please help me out sir.