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Having created the above of objects, you need to include the following statements in the Sub Form_Load event to start filling the DataTable with data from the data source. Other than that, you should also create an instance of the SqlCommandBuilder which is used to manipulate data such as updating and deleting data in the Datatable and send the changes back to the data source. The statements are: Private MyDatAdp As New SqlDataAdapter Besides, you also need to create an instance of the DataTable. The next step is to create an instance of the SqlDataAdpater in our code so that we can populate the DataTable with data from the data source. Īfter establishing connection to the database, you can open the database using the following syntax: M圜n.Open() 30.2 Populating Data in ADO.NETĮstablishing connection to a database in Visual Basic 2010 using SqlConnection alone will not present anything tangible things to the user to manipulate the data until we add more relevant objects and write relevant codes to the project. * You need to change the reference to the SQL server ( lenovo-4903350b\mssmlbiz) as well as the path to database file Test.mdf. “User Instance=True Integrated Security=SSPI” M圜n.ConnectionString = “Data Source=lenovo-4903350b\mssmlbiz AttachDbFilename=C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\Test.mdf ” & _ Having created the instance of the SqlConnecton object, the next step is to establish a connection to the data source using the SQL ConnectionString property. To initialize the variable to a new SqlConnection object, we use the following syntax: Private M圜n As New SqlConnection

Since we will work with SQL database in our example, we will use the SqlConnection object. OleDbConnection is used to access OLEDB data such as Microsoft Access whilst SqlCOnnection is used to access data provided by Microsoft SQL server. Now we are ready to connect to this new database.ĪDO.NET offers a number of connection objects such as OleDbConnection, SqlConnection and more. Enter a few data in the table and click Save All to save the data.

After creating the database, build a table called Contacts and create two fields and name them ContactName and State respectively. We shall name this database file as test.mdf. Since we are using SQL Server 2008 as the database engine, we will use Microsoft Studio Management Express to create a database with the mdf extension. Before we begin, let’s create a new database. In Visual Basic 2010, we need to create the connection to a database before we can access its data. I have tested my Command and it works on sql but not on the program.30.1 Creating Connection to a Database using ADO.NET

''Add SqlDbType.VarChar, SqlDbType.VarChar, SqlDbType.Int) Item.Command = New SqlClient.SqlCommand("UPDATE T_Programme Set, , WHERE pro_no SchoolTypes.Connexion) The code throw no errors it just didn't Execute the satement Private Sub Update_Program(item As Programme)