codice:
Imports System.Data
Public Class Form1

    Inherits System.Windows.Forms.Form

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim myconnect As SqlClient.SqlConnection = New SqlClient.SqlConnection("Server=(local); Database=provasql")
        Dim mycommand As SqlClient.SqlCommand = New SqlClient.SqlCommand()
        mycommand.Connection = myconnect
        mycommand.CommandText = "INSERT INTO Tabella1 (Nome, Cognome) VALUES ('Mario','Rossi')"
        myconnect.Open()
        mycommand.ExecuteNonQuery()
        myconnect.Close()
        MsgBox("Operazione conclusa con successo")

    End Sub
End Class
Questo dodice non funziona, non riesco a capire il perchè, alla sua esecuzione mi da ERRORE DI SISTEMA.
Dove sbaglio?