ASP.Net中使用VB.Net调用存储过程并得到返回值

//存储过程代码
　CREATE PROCEDURE [AddNewInvoiceInfo] (@sUserID int,@sClaimMethod varchar(50),@sInvoiceNum 　varchar(50),@sInvoiceDate datetime,@sBuyCity varchar(50))AS
　Insert Into SMB_InvoiceInfo (MemberID,ClaimMethod,InvoiceNum,InvoiceDate,InvoiceCity) Values 　(@sUserID,@sClaimMethod,@sInvoiceNum,@sInvoiceDate,@sBuyCity)
　return  @@IDENTITY
　GO

//调用存储过程代码
　Dim CN As New SqlConnection()
　Dim InvoiceID As String
　Try
    CN.ConnectionString = DBConStr
    CN.Open()
    Dim CMD As SqlCommand
    CMD = New SqlCommand(AddNewInvoiceInfo, CN)
    CMD.CommandType = CommandType.StoredProcedure

    CMD.Parameters.Add(New SqlParameter(@sUserID, SqlDbType.Int))
    CMD.Parameters(@sUserID).Value = CInt(UserID.Text)

    CMD.Parameters.Add(New SqlParameter(@sClaimMethod, SqlDbType.VarChar, 50))
    CMD.Parameters(@sClaimMethod).Value = TransName.Text

    CMD.Parameters.Add(New SqlParameter(@sInvoiceNum, SqlDbType.VarChar, 50))
    CMD.Parameters(@sInvoiceNum).Value = InvoiceNum.Text

    CMD.Parameters.Add(New SqlParameter(@sInvoiceDate, SqlDbType.DateTime))
    CMD.Parameters(@sInvoiceDate).Value = InvoiceDate.SelectedDate.Date

    CMD.Parameters.Add(New SqlParameter(@sBuyCity, SqlDbType.VarChar, 50))
    CMD.Parameters(@sBuyCity).Value = BuyCity.Text

    CMD.Parameters.Add(New SqlParameter(@sInvoiceID, SqlDbType.Int))
    CMD.Parameters(@sInvoiceID).Direction = ParameterDirection.ReturnValue

    CMD.ExecuteNonQuery()
    InvoiceID = CMD.Parameters(@sInvoiceID).Value.ToString()
    CMD.Dispose()
　Catch ex As Exception
    Response.Write(ex.ToString())
　Finally
    CN.Close()
　End Try

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