ADO.NET的问题

在VS2005里的website
想要通过一个程序向数据库新增数据，请问这个代码有什么问题Partial Class AddNew
    Inherits System.Web.UI.Page

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



        Dim con As String = "Server=locost;database=Plant;Integrated Security=SSPI"
        Dim myconn = New System.Data.SqlClient.SqlConnection()
        myconn.ConnectionString = (con)
        myconn.open()
        Dim sqlcmd As Data.SqlClient.SqlCommand = New Data.SqlClient.SqlCommand()

        sqlcmd.Connection = myconn
         = "insert into values('TextBox1.Text') "
        sqlcmd.ExecuteNonQuery()
        sqlcmd.Dispose()

        myconn.close()


    End Sub
End Class