Vb.net Visual Studio和SQL Server 2008出现错误

我在调试网站的代码时遇到此错误。我的目标是将数据插入SQLServer2008数据库

源错误：

    objcnd.Parameters.Add(New SqlParameter("@username", strun))
    Ligne 22 :         objcnd.Parameters.Add(New SqlParameter("@password", strpw))
    Ligne 23 :         objcnd.ExecuteNonQuery()
    Ligne 24 :         'close connection
    Ligne 25 :         objconnection.Close()

错误

[SqlException（0x80131904）：靠近“？”的语法不正确。]
System.Data.SqlClient.SqlConnection.OnError（SqlException异常，布尔breakConnection）+2030802
System.Data.SqlClient.SqlInternalConnection.OnError（SqlException异常，布尔断开连接）+5009584
System.Data.SqlClient.TdsParser.throweexception和warning（）+234
System.Data.SqlClient.TdsParser.Run（RunBehavior RunBehavior，SqlCommand cmdHandler，SqlDataReader dataStream，BulkCopySimpleResultSet bulkCopyHandler，TdsParserStateObject stateObj）+2275

用vb.net编写的源代码

Imports System
Imports System.Data
Imports System.Data.SqlClient

Partial Class index
   Inherits System.Web.UI.Page

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)   Handles Button1.Click
    Dim strun As String = Request.Form("username")
    Dim strpw As String = Request.Form("password")

    Dim objconnection As SqlConnection = Nothing
    Dim objcnd As SqlCommand = Nothing
    Dim strconnection As String, strSQL As String
    'connection string 
    strconnection = ("Data Source=myPC-PC;Database=mytempDB;Integrated Security=true ")
    objconnection = New SqlConnection(strconnection)
    objconnection.ConnectionString = strconnection
    objconnection.Open()
    strSQL = "insert into userTD(username,password) values(?,?)"
    objcnd = New SqlCommand(strSQL, objconnection)
    objcnd.Parameters.Add(New SqlParameter("@username", strun))
    objcnd.Parameters.Add(New SqlParameter("@password", strpw))
    objcnd.ExecuteNonQuery()
    'close connection
    objconnection.Close()
    Response.Write("Entered Successfully ! ")

End Sub
End Class

---

提前感谢。

为SqlClient引擎使用具有相同参数名称的占位符

strSQL = "insert into userTD(username,password) values(@username,@password)"

此外，我建议您使用用于连接的（对于所有一次性对象更好，但是如果出现异常并且连接保持打开状态，则连接将是一个大问题）

Using objconnection = New SqlConnection(strconnection)
   ......

   objcnd.ExecuteNonQuery()

   ' No need to close explicititly the connection, ' 
   ' the following End Using statement takes care of that'
   ' also in case of exceptions.....'
End Using