Solved

VB.net Problem loading dataset into DataGridView

Posted on 2014-11-15
5
211 Views
Last Modified: 2014-11-16
Hi

I am using the following code to load the results of a dataset into a DataGridView. Nothing loads into the DataGridView. What am I doing wrong

    Private Sub btnLoadDataSet_Click(sender As System.Object, e As System.EventArgs) Handles btnLoadDataSet.Click
        Me.DataGridView1.DataSource = Create_DataSet()
    End Sub

    Function Create_DataSet() As DataSet
        Try
            Dim connectionString As String = Globals.ThisAddIn.oRIGHT.lblConnectionString.Text

            ' Create a SqlConnection to the Northwind database.
            Using connection As SqlConnection = New SqlConnection( _
               connectionString)

                ' Create a SqlDataAdapter for the Suppliers table.
                Dim suppliersAdapter As SqlDataAdapter = _
                   New SqlDataAdapter()

                ' A table mapping names the DataTable.
                suppliersAdapter.TableMappings.Add("Table", "Suppliers")

                ' Open the connection.
                connection.Open()
                Console.WriteLine("The SqlConnection is open.")

                ' Create a SqlCommand to retrieve Suppliers data.
                Dim suppliersCommand As SqlCommand = New SqlCommand( _
                   "SELECT ID, Company FROM Suppliers;", _
                   connection)
                suppliersCommand.CommandType = CommandType.Text

                ' Set the SqlDataAdapter's SelectCommand.
                suppliersAdapter.SelectCommand = suppliersCommand

                ' Fill the DataSet.
                Dim oDataSet As DataSet = New DataSet("Suppliers")
                suppliersAdapter.Fill(oDataSet)

                ' Create a second SqlDataAdapter and SqlCommand to get
                ' the Products table, a child table of Suppliers.  
                Dim productsAdapter As SqlDataAdapter = _
                    New SqlDataAdapter()
                productsAdapter.TableMappings.Add("Table", "Products")

                Dim productsCommand As SqlCommand = New SqlCommand( _
                   "SELECT ID, [Supplier IDs] FROM Products;", _
                   connection)
                productsAdapter.SelectCommand = productsCommand

                ' Fill the DataSet.
                productsAdapter.Fill(oDataSet)

                ' Close the connection.
                connection.Close()
                Console.WriteLine("The SqlConnection is closed.")

                ' Create a DataRelation to link the two tables
                ' based on the SupplierID.
                Dim parentColumn As DataColumn = _
                   oDataSet.Tables("Suppliers").Columns("ID")
                Dim childColumn As DataColumn = _
                   oDataSet.Tables("Products").Columns("Supplier IDs")
                Dim relation As DataRelation = New  _
                   System.Data.DataRelation("SuppliersProducts", _
                   parentColumn, childColumn)
                oDataSet.Relations.Add(relation)

                Console.WriteLine( _
                   "The {0} DataRelation has been created.", _
                   relation.RelationName)

                Create_DataSet = oDataSet
            End Using



        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    End Function
0
Comment
Question by:murbro
  • 3
  • 2
5 Comments
 
LVL 62

Expert Comment

by:Fernando Soto
ID: 40445745
This line of code,

Me.DataGridView1.DataSource = Create_DataSet()

returns a DataSet object and assigns it to the DataSource of the DataGridView. The DataSet holds a collection of DataTables. So Which of the tables do you want the DataGridView to Display? For Example this should work to display the Products table.

Me.DataGridView1.DataSource = Create_DataSet().Tables("Products")
0
 

Author Comment

by:murbro
ID: 40445751
Hi

I wanted to display the combination of the Products and Suppliers table or say two columns from each
0
 
LVL 62

Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 40445758
In that case you will need two DataGridView's one for the Products and another for the Suppliers.
0
 

Author Closing Comment

by:murbro
ID: 40445792
Thanks
0
 
LVL 62

Expert Comment

by:Fernando Soto
ID: 40445794
Not a problem, glad to help.
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

1.0 - Introduction Converting Visual Basic 6.0 (VB6) to Visual Basic 2008+ (VB.NET). If ever there was a subject full of murkiness and bad decisions, it is this one!   The first problem seems to be that people considering this task of converting…
Parsing a CSV file is a task that we are confronted with regularly, and although there are a vast number of means to do this, as a newbie, the field can be confusing and the tools can seem complex. A simple solution to parsing a customized CSV fi…
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…

773 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question