c# - textbox value inside a repeater and save -


i have code here gets transaction number on search bar , show on page. have 2 textbox wherein client enter price payed , or no of receipt. however, getting error

"object reference not set instance..."

.aspx

<form id="form1" runat="server"> <div> <asp:repeater id="rptrcashiertable" runat="server">     <itemtemplate>         <div>             <h1 align="center">transaction number: <label><%# eval("txnno") %></label>           <h2>name:<label><%# eval("fname") %></label>          <label><%# eval("mname") %></label>          <label><%# eval("lname") %></label></h2>                       <h2>contact number: <label><%# eval("mobile") %></label></h2>          <h2>product ordered: <label><%# eval("pname") %></label></h2>          <h2>product id:<label><%# eval("productid") %></label></h2>          <h2>price:               <asp:textbox id="textbox1" runat="server"></asp:textbox></h2>          <h2>or no.:               <asp:textbox id="textbox2" runat="server"></asp:textbox></h2>                 <asp:button id="button1" runat="server" text="submit" onclick="btn_update" />         </div>     </itemtemplate> </asp:repeater> </div> </form>

.cs

public partial class transactiondetails : system.web.ui.page {     sqlquery sql = new sqlquery();     dataset ds = new dataset();      protected void page_load(object sender, eventargs e)     {         if (!ispostback)         {             bindcasiertable();         }      }     private void bindcasiertable()     {                     string transctid = request.querystring["txnno"];         ds = sql.dsgetclientdetails(transctid);          rptrcashiertable.datasource = ds;         rptrcashiertable.databind();     }      protected void btn_update(object sender, eventargs e)     {           foreach (repeateritem item in rptrcashiertable.items)         {                                         if (item.itemtype == listitemtype.item)             {                 var txtprice = item.findcontrol("textbox1") textbox;                 var txtorno = item.findcontrol("textbox2") textbox;                 string txnno = request.querystring["txnno"];                 ds = sql.dsaddpayment(txtprice.text, txtorno.text, txnno);                 txtprice.text = string.empty;                 txtorno.text = string.empty;                 bindcasiertable();             }           }     } }

i using mssql 2008 , stored procedure. want update , put price payed , or number respective field.

that error message means assigning null value. guess error pops out here: 

string transctid = request.querystring["txnno"]

you should check if null first:

if(request.querystring["txnno"]!=null) {  // make assignation here }

Comments

Post a Comment

Popular posts from this blog

python - Operations inside variables -

this question has answer here: evaluating mathematical expression in string 12 answers i want make python script finds maximum possible output using 2 operations. problem says there syntax error @ 2nd last line, in b in there. how can fix it? x = 0 = int(input("1st number:")) c = int(input("2nd number:" )) e = int(input("3rd number:" )) in range(4): if == 0: b = "+" elif == 1: b = "-" elif == 2: b = "/" else: b = "*" j in range(4): if j == 0: d = "+" elif j == 1: d = "-" elif j == 2: d = "/" else: d = "*" k = b c d e print(k) if you're after variables e on single line, couldn...
Read more

Generic Map Parameter java -

i having lot of methods of type: public static list<eduusers> getdetails(class c, map<string, integer> params) { list<eduusers> details = null; session session = hibernateutil.getsessionfactory().opensession(); transaction tx = null; try { tx = session.begintransaction(); criteria cr = session.createcriteria(c); (map.entry<string, integer> entry : params.entryset()) { cr.add(restrictions.eq(entry.getkey(), entry.getvalue())); } details = cr.list(); tx.commit(); } catch (exception asd) { log.debug(asd.getmessage()); if (tx != null) { tx.commit(); } } { session.close(); } return details; } i trying have generic method them , have written far: public static <t> list<t> getdetails(class<t> c, class<t> b) { l...
Read more

arrays - What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it? -

what arrayindexoutofboundsexception mean , how rid of it? here code sample triggers exception: string[] name = {"tom", "dick", "harry"}; for(int = 0; i<=name.length; i++) { system.out.print(name[i] +'\n'); } your first port of call should documentation explains reasonably clearly: thrown indicate array has been accessed illegal index. index either negative or greater or equal size of array. so example: int[] array = new int[5]; int boom = array[10]; // throws exception as how avoid it... um, don't that. careful array indexes. one problem people run thinking arrays 1-indexed, e.g. int[] array = new int[5]; // ... populate array here ... (int index = 1; index <= array.length; index++) { system.out.println(array[index]); } that miss out first element (index 0) , throw exception when index 5. valid indexes here 0-4 inclusive. correct, idiomatic for statement here be: for (int index = 0; index <...
Read more