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    <p>I'm not sure what exactly is wrong, I can only imagine that <code>connectionStringI</code> is somehow <code>Null</code> when you are trying to use it, but I think it is good practice to close the connection every time you are done using it.</p> <p>So when you fetch the data instead of leaving the connection open as you do now, do something like</p> <pre><code>With New SqlConnection(connectionString) Try .Open() ' Do Stuff Catch ' Handle your exception Finally .Close() End Try End With </code></pre> <p>That way your connection will always be closed and you won't have to worry about checking whether or not it is already open.</p> <p>UPDATE</p> <p>I have taken the liberty of rewriting your code the way I would do it. Can you please give this a try and see if it works for you/</p> <p>You connection string property:</p> <pre><code>Private ReadOnly Property connectionString As String Get Return "Data Source=XXXX;Initial Catalog=XXXX;User ID=XXXX;Password=XXXX" End Get End Property </code></pre> <p>The sub which inserts the data:</p> <pre><code>Private Sub btnADD_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnADD.Click Dim transaction As SqlTransaction = Nothing With New SqlConnection(connectionString) Try Call .Open() transaction = .BeginTransaction() With .CreateCommand() .Transaction = transaction .CommandText = "INSERT INTO [tbl_info] ([ID], [Name]) VALUES (@ID,@Name);" With .Parameters .AddWithValue("ID", txtID.Text) .AddWithValue("Name", txtName.Text) End With Call .ExecuteNonQuery() Call transaction.Commit() Call MessageBox.Show("has been inserted successfully") End With Catch ex As Exception Call transaction.Rollback() Call MessageBox.Show(ex.Message, "Error") Finally Call .Close() End Try End With Call txtID.Clear() Call txtName.Clear() End Sub </code></pre> <p>The sub which updates the data:</p> <pre><code>Private Sub btnEdit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEdit.Click Dim transaction As SqlTransaction = Nothing With New SqlConnection(connectionString) Try Call .Open() transaction = .BeginTransaction() With .CreateCommand() .Transaction = transaction .CommandText = "UPDATE [tble_info] SET [Name]=@Name WHERE [ID]=@ID;" With .Parameters .AddWithValue("Name", txtName.Text) .AddWithValue("ID", txtID.Text) End With Call .ExecuteNonQuery() Call transaction.Commit() Call MessageBox.Show("has been update successfully") End With Catch ex As Exception Call transaction.Rollback() Call MessageBox.Show(ex.Message, "Error") Finally Call .Close() End Try End With End Sub </code></pre> <p>If you make the connection string a (read-only) property, assuming it doesn't change, then you won't have to worry about whether it is has a value or not when you use it. Then all you have to worry about is make sure that the connection string is correct.</p> <p>Note that I haven't tested this code, but it should work as is I think.</p>
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    1. USyu_ominae
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    1. COi try it. nothing change happen. its show the same error [InvalidOperationExeption was unhadled The connectionString property has not been initialize]
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    2. COYou have verified that `connectionString` is not null when you initialise your connection? Are developing in 32 bit or in 64?
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      1. USyu_ominae
    3. COi'm using 32bit. thanks for revising my code. it works.i dont know what to say, i'm so happy. many thanks for doing such effort to help me.
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