a[sj]=nl;
    
           int T; 
try
   {
    for(T=0;T<=sj;T++)
    {           
     SqlConnection con=db.createcon();
     con.Open();
 SqlCommand cmm=new SqlCommand("delete from mess where id='"+a[T]+"'",con);
     cmm.ExecuteNonQuery();
     con.Close();    
    }
    this.Label1.Text="删除成功";
    this.bind();   }   catch   {    this.bind();
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