Imports System.Data
Imports System.Data.OleDb
Imports System.Windows.Forms
public class DataSetWithRelation
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
Dim scores_dataset As New DataSet("Scores")
Dim students_table As DataTable = scores_dataset.Tables.Add("Students")
students_table.Columns.Add("FirstName", GetType(String))
students_table.Columns.Add("LastName", GetType(String))
students_table.Columns.Add("StudentId", GetType(Integer))
students_table.Columns("StudentId").Unique = True
Dim first_last_columns() As DataColumn = { _
students_table.Columns("FirstName"), _
students_table.Columns("LastName") _
}
students_table.Constraints.Add(New UniqueConstraint(first_last_columns))
Dim test_scores_table As DataTable = scores_dataset.Tables.Add("TestScores")
test_scores_table.Columns.Add("StudentId", GetType(Integer))
test_scores_table.Columns.Add("TestNumber", GetType(Integer))
test_scores_table.Columns.Add("Score", GetType(Integer))
Dim studentid_testnumber_score_columns() As DataColumn = { _
test_scores_table.Columns("StudentId"),test_scores_table.Columns("TestNumber") _
}
test_scores_table.Constraints.Add(New UniqueConstraint(studentid_testnumber_score_columns))
scores_dataset.Relations.Add("Student Test Scores",students_table.Columns("StudentId"),test_scores_table.Columns("StudentId"))
students_table.Rows.Add(New Object() {"A", "A", 1})
students_table.Rows.Add(New Object() {"B", "B", 2})
students_table.Rows.Add(New Object() {"C", "C", 3})
students_table.Rows.Add(New Object() {"D", "D", 4})
Dim score As New Random
For id As Integer = 1 To 4
For test_num As Integer = 1 To 10
test_scores_table.Rows.Add( _
New Object() {id, test_num, score.Next(65, 100)})
Next test_num
Next id
students_table.Rows(1).SetColumnError(2, "Bad name format")
students_table.Rows(2).RowError = "Missing registration"
grdScores.DataSource = scores_dataset
End Sub
End Class
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Public Class Form1
Inherits System.Windows.Forms.Form
'Form overrides dispose to clean up the component list.
<System.Diagnostics.DebuggerNonUserCode()> _
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.grdScores = New System.Windows.Forms.DataGrid
CType(Me.grdScores, System.ComponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
'
'grdScores
'
Me.grdScores.DataMember = ""
Me.grdScores.Dock = System.Windows.Forms.DockStyle.Fill
Me.grdScores.HeaderForeColor = System.Drawing.SystemColors.ControlText
Me.grdScores.Location = New System.Drawing.Point(0, 0)
Me.grdScores.Name = "grdScores"
Me.grdScores.Size = New System.Drawing.Size(292, 273)
Me.grdScores.TabIndex = 1
'
'Form1
'
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.Controls.Add(Me.grdScores)
Me.Name = "Form1"
Me.Text = "MemoryDataSetWithError"
CType(Me.grdScores, System.ComponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)
End Sub
Friend WithEvents grdScores As System.Windows.Forms.DataGrid
End Class
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