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  {
  if (!IsPostBack)
  {
  SqlDataSource1.SelectCommand = "SELECT * from [shang_pin]";
  }
  if(Request .QueryString ["ming_zi"]!=null )
  {
   
  if (Request.QueryString["ming_zi"].ToString() == "È«²¿")
  {
   
  SqlDataSource1.SelectCommand ="SELECT * from [shang_pin]";
  }
  }
  }
---------
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C# code:

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
SqlDataSource1.SelectCommand = "SELECT * from [shang_pin]";
}
if(Request .QueryString ["ming_zi"]!=null )
{

if (Request.QueryString["ming_zi"].ToString() == "È«²¿")
{

SqlDataSource1.Select


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