Create Table Relationship and Load Data into DataGrid


This sample code demonstrates how to Create Table Relationship and Load Data into DataGrid using

Namespaces Used :

Imports System
Imports System.Drawing
Imports System.Collections
Imports System.ComponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Data.SqlClient

Code :

Public Class MainClass

Shared Sub Main( )
Application.Run(New ADOForm1() )
End Sub

End Class

Public Class ADOForm1
Inherits System.Windows.Forms.Form
Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid

Private components As System.ComponentModel.Container
' private System.Data.ADO.ADOConnection myConnection;
Private myConnection As System.Data.SqlClient.SqlConnection
Private myDataSet As System.Data.DataSet
Private myCommand As System.Data.SqlClient.SqlCommand
Private myCommand2 As System.Data.SqlClient.SqlCommand
Private myDataAdapter As System.Data.SqlClient.SqlDataAdapter
Private myDataAdapter2 As System.Data.SqlClient.SqlDataAdapter

Public Sub New( )
InitializeComponent( )

' create the connection object and open it
Dim connectionString As String = "Server=localhost; uid=sa;pwd=; database=DatabaseName"
myConnection = New System.Data.SqlClient.SqlConnection(connectionString)

' create the DataSet and set a property
myDataSet = New System.Data.DataSet()
myDataSet.CaseSensitive = True
' create the SqlCommand object and assign the
' connection and the select statement
myCommand = New System.Data.SqlClient.SqlCommand()
myCommand.Connection = myConnection
myCommand.CommandText = "Select * from Employees"

myCommand2 = New System.Data.SqlClient.SqlCommand()
myCommand2.Connection = myConnection
myCommand2.CommandText = "Select * from Orders"

' create the myDataAdapter object and pass in the
' SQL Command object and establish the table mappings
myDataAdapter = New System.Data.SqlClient.SqlDataAdapter()
myDataAdapter2 = New System.Data.SqlClient.SqlDataAdapter()
myDataAdapter.SelectCommand = myCommand
myDataAdapter2.SelectCommand = myCommand2
myDataAdapter.TableMappings.Add("Table", "Employees")
myDataAdapter2.TableMappings.Add("Table", "Orders")

' Tell the myDataAdapter object to fill the DataSet
myDataAdapter.Fill (myDataSet)
myDataAdapter2.Fill (myDataSet)

Dim myDataRelation As System.Data.DataRelation
Dim dataColumn1 As System.Data.DataColumn
Dim dataColumn2 As System.Data.DataColumn
dataColumn1 = myDataSet.Tables("Employees").Columns("EmployeeID")
dataColumn2 = myDataSet.Tables("Orders").Columns("EmployeeID")

myDataRelation = New System.Data.DataRelation("EmployeesToOrders", dataColumn1, dataColumn2)
myDataSet.Relations.Add (myDataRelation)
Dim dataSetView As DataViewManager = myDataSet.DefaultViewManager

' display it in the grid
dataGrid1.DataSource = dataSetView
dataGrid1.DataMember = "Employees"

End Sub 'New

Private Sub InitializeComponent()
Me.components = New System.ComponentModel.Container()
Me.dataGrid1 = New System.Windows.Forms.DataGrid()
dataGrid1.Location = New System.Drawing.Point(48, 24)
dataGrid1.Size = New System.Drawing.Size(368, 160)
dataGrid1.TabIndex = 0
Me.Text = "ADOFrm1"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(464, 273)
Me.Controls.Add (dataGrid1)
End Sub
End Class


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