VB.NET中向access数据库中添加数据，，，为什么总是添加失败？

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Try

        Dim myConn As OleDbConnection = New OleDbConnection()

        myConn.ConnectionString = ConnString

        myConn.Open()

        Dim strInsert As String = "insert into Table1  (时间，温度，入射功率，反射功率 ) values('" + Label1.Text + "','" + Label2.Text + "','" + Label3.Text + "','" + Label4.Text + "')"

        Dim cmdInsert As OleDbCommand = New OleDbCommand(strInsert, myConn)

        cmdInsert.ExecuteNonQuery()

        MsgBox("添加成功！")

    Catch ex As Exception

        MsgBox("添加失败")

    End Try

End Sub

End Class