我用VB.NET编了一个管理系统的程序，可是不知为什么运行时出现“用户‘Sa’登录失败”的问题，显示原因为：未与信任SQL Server连接相关联
有没有哪位能帮帮我这个菜鸟尽快解决这个问题，不胜感激！！

下面是我连接数据库的代码：SQL里需要做些什么吗？
Option Explicit On
Imports System.Data
Imports System.Data.SqlClient
Public Class Class1

Public Shared Connstr As String = "server=localhost;database=OrderSys;uid=Sa;pwd=Sa"

Public Function CreateDataTable(ByVal SQLcmd As String) As DataTable
Dim conn As SqlConnection
Dim myAdapter As SqlDataAdapter
Dim myDataSet As New DataSet
Try
conn = New SqlConnection(Connstr)
conn.Open()
myAdapter = New SqlDataAdapter(SQLcmd, conn)
myAdapter.Fill(myDataSet)
conn.Close()
Return myDataSet.Tables(0)
Catch ex As Exception
End Try
End Function
Public Function updatadatabase(ByVal sqlcmd As String)
Try
Dim conn As SqlConnection, cmd As SqlCommand
conn = New SqlConnection(Connstr)
conn.Open()
cmd = New SqlCommand(sqlcmd, conn)
cmd.ExecuteNonQuery()
conn.Close()
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Function
End Class