**************：为什么会出现下面的错误？我该怎么解决(复合性查找的问题)？

Question

**************：为什么会出现下面的错误？我该怎么解决？ 
当我不输入条件查找的时候就可以显示数据，当我输入条件的时候就出现下面的错误：
例外詳細資訊: System.Data.OleDb.OleDbException: 關鍵字 'and' 附近的語法不正確。
行 127:        myCommand.Fill(ds, "qarpt");   public static string add1(string s,string ss,string s1)
               {
                               string str="" ;
                               if (s1!=""&&s1!=null)
                               {
                               str="and "+s+ss+"'"+s1+"' ";
                               }
                              return str;
               }
DataView CreateDataSource()   
               {   
                              string str1,str2;
str2="select * from qarpt where section='"+Session["section"]+"' order by pono desc"; 
str1="SELECT COUNT(*) as co from qarpt where section='"+Session["section"]+"' order by pono desc";  
                              string s1="",s2="";
                              s1=Request.Form["radio"];//检验报告主管签核
                                str1+=add1("radio","=",s1);
                                str2+=add1("radio","=",s1);
                              s1=Request.Form["jieguo"];//检验报告判断结果
                                str1+=add1("jieguo","=",s1);
                                str2+=add1("jieguo","=",s1);
OleDbConnection myConnection = new OleDbConnection("provider=sqloledb.1;datasource=(local);uid=sa;pwd=123456;initial catalog=othp");        
OleDbDataAdapter myCommand = new  OleDbDataAdapter(str2, myConnection); 
DataSet ds = new DataSet();    
myCommand.Fill(ds, "qarpt");   
MyList.DataSource = ds.Tables["qarpt"].DefaultView;
MyList.DataBind();                        
return ds.Tables["qarpt"].DefaultView;    
myConnection.Close();            
Page.DataBind();                        
               } 

Answer 1

MessageBox.Show(str1 + "\n" + str2);//查看一下CommandText错在哪里

Answer 2

str2="select * from qarpt where section='"+Session["section"]+"' ";
str1="SELECT COUNT(*) as co from qarpt where section='"+Session["section"]+"' ";                              string s1="",s2="";
                              s1=Request.Form["radio"];//检验报告主管签核
                                str1+=add1("radio","=",s1);
                                str2+=add1("radio","=",s1);
                              s1=Request.Form["jieguo"];//检验报告判断结果
                                str1+=add1("jieguo","=",s1);
                                str2+=add1("jieguo","=",s1);
str1+=" order by pono desc";  str2+=" order by pono desc";