Question

Query String Doubt

Asked by: meeran03

I ve a  grid view which has linkbutton(edittemplate) consists of cname on clicking this ,
,i need to pass cid value, to <a href="south.aspx?cid=????"> Like that to all link....
how can i do it..

table 1 ( table structure)
cid int primary key
cname varchar

<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Data" %>
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <link href="style/sample.css" rel="stylesheet" type="text/css" />
</head>
<body>
 
    <form id="form1" runat="server">
    <div id="container">
  
    <div id="left">
 
 
<%  
                    string constr = ConfigurationManager.AppSettings["cons"];
                    SqlConnection con = new SqlConnection(constr);
                    string cmd = "Select * from citytable";
                    SqlDataAdapter da = new SqlDataAdapter(cmd, con);
                    DataSet ds = new DataSet();
                    da.Fill(ds);
                    GridView1.DataSource = ds;
                    GridView1.DataBind();
          %>
                                <a href="south.aspx?cid='Doubt How to get cid'"><img src="images/south_indian.gif" border="0" /></a></td>
							<td width="25%">
                                <a href="North1.aspx?cid='Doubt How to get cid'"><img src="images/north_indian.gif" border="0"/></a></td>
						</tr>
						<tr>
							<td>
                                <a href="udipi.aspx?cid='Doubt How to get cid'"><img src="images/udipi.gif" border="0" /></a></td>
							<td>
                                <a href="chettinad.aspx?cid='Doubt How to get cid'"><img src="images/chettinad.gif" border="0" /></a></td>
						</tr>
						<tr>
							<td>
                                <a href="hyderabad.aspx?cid='Doubt How to get cid'"><img src="images/hyderabad.gif" border="0"/></a></td>
							<td>
                                <a href="kerala.aspx?cid='Doubt How to get cid'"><img src="images/kerela.gif" /></a></td>
						</tr>
						<tr>
							<td>
                                <a href="american.aspx?cid='Doubt How to get cid'"><img src="images/american.gif" border="0"/></a></td>
							<td>
                                <a href="chinese.aspx?cid='Doubt How to get cid'"><img src="images/chinese.gif" border="0" /></a></td>
						</tr>
					</table>
 
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Style="left: 8px;
            position: relative; top: 112px">
            <Columns>
                <asp:TemplateField HeaderText="City Name">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        &nbsp;<asp:LinkButton ID="LinkButton1" Text='<%# Bind("city") %>' runat="server" Style="position: relative">LinkButton</asp:LinkButton>
                        
                    </ItemTemplate>
                </asp:TemplateField>

                                  
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Asked On
2008-11-20 at 04:17:46ID23921157
Topics

Programming for ASP.NET

,

.NET Framework 2.x

,

Microsoft Visual C#.Net

Participating Experts
3
Points
500
Comments
18

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Answers

 

by: davrob60Posted on 2008-11-20 at 05:42:57ID: 23003495

  1. dont use <a href, use a
    <asp:HyperLink  
  2. set
    NavigateUrl='<%# string.concat("south.aspx?cid=", eval("cid").tostring()) %>' 

 

by: keustermansPosted on 2008-11-20 at 05:46:33ID: 23003529

What you can do here add a column to Table1 that will hold the pagename that you link needs to point to as well as the image path that you want to load.

cId              cName              link                            imagePath
1                Myname            south.aspx?cid=      images/south_indian.gif

select cid, link+convert(varchar,cid) as link, imagePath from ......

this will geneerate a resultset as follows

1     MyName  south.aspx?cid=1   images/south_indian.gif
     

Fill a dataset with this data bind to a repeater and use the repeater to create the links for you:

your Item template should look something like this:

<ItemTemplate>
<td><a href="<%# DataBinder.Eval(Container.DataItem,"link") %>"><img src="<%# DataBinder.Eval(Container.DataItem,"imagePath") %> "/></a></td>
</ItemTemplate>

Resource on how to use a repeater control: http://www.devhood.com/view_source.aspx?source=/news/news_sub.aspx

 

by: keustermansPosted on 2008-11-20 at 05:49:58ID: 23003561

This will make the whole thing more dynamic.

 

by: meeran03Posted on 2008-11-20 at 05:50:11ID: 23003564

I got followin errors  

'string' does not contain a definition for 'concat'    
 The name 'eval' does not exist in the current context   

<asp:HyperLink ID="HyperLink2" runat="server" NavigateUrl='<%# string.concat("south.aspx?cid=", eval("cid").tostring()) %>'>HyperLink</asp:HyperLink>	    

                                              
1:

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by: meeran03Posted on 2008-11-20 at 05:51:53ID: 23003580


  • Now only this error 
  • The name 'eval' does not exist in the current context
     

<asp:HyperLink ID="HyperLink2" runat="server" NavigateUrl='<%# string.Concat("south.aspx?cid=", eval("cid").ToString()) %>'>HyperLink</asp:HyperLink>        

 

by: davrob60Posted on 2008-11-20 at 05:54:52ID: 23003603

well, i dident saw it was outside the gridview.

the link must be inside a binded control like a repeter, a gridview or a detailview.

 

by: meeran03Posted on 2008-11-20 at 06:02:57ID: 23003673

i binded inside the gridview i got the same error ,

The name 'eval' does not exist in the current context 

 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Style="left: 8px;
            position: relative; top: 112px">
            <Columns>
                <asp:TemplateField HeaderText="City Name">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        &nbsp;<asp:HyperLink ID="LinkButton1" Text='<%# Bind("city") %>' NavigateUrl='<%# string.Concat("south.aspx?cid=", eval("cid").ToString()) %>' runat="server" Style="position: relative">Hyper</asp:HyperLink>
                                            </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Style="left: 8px;
            position: relative; top: 112px">
            <Columns>
                <asp:TemplateField HeaderText="City Name">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        &nbsp;<asp:HyperLink ID="LinkButton1" Text='<%# Bind("city") %>' NavigateUrl='<%# string.Concat("south.aspx?cid=", eval("cid").ToString()) %>' runat="server" Style="position: relative">Hyper</asp:HyperLink>
                                            </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

                                              
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by: davrob60Posted on 2008-11-20 at 06:06:10ID: 23003700

try Eval

 

by: meeran03Posted on 2008-11-20 at 06:07:25ID: 23003709

hi keustermans,

Sorry mate , i had used cid field for many table , if i change the structure now i have to delete some important data's which are used by other tables.



 

by: davrob60Posted on 2008-11-20 at 06:10:32ID: 23003747

 

by: KarinLoosPosted on 2008-11-20 at 06:15:40ID: 23003801

Well you could use the page_load event, and in this event pick up the link and dynamically set the href.
pretty simple really. If woud however REQUIRE that you put the runat='server'  attribute to each of your links as well as giving each tag a unique id  ( ie id='abc'  ) .


     

 

by: meeran03Posted on 2008-11-20 at 06:17:59ID: 23003822

Hi , it works....
Now i want that City in a label control, so that i can say city from this cid  page...

Text='<%# Bind("city") %>' ---> In A label control in a page....to display its details ..

   <ItemTemplate>
                        <asp:HyperLink ID="LinkButton1" Text='<%# Bind("city") %>' NavigateUrl='<%# string.Concat("south.aspx?cid=", eval("cid").ToString()) %>' runat="server" Style="position: relative">Hyper</asp:HyperLink>
                                           </ItemTemplate>


 

by: davrob60Posted on 2008-11-20 at 06:23:16ID: 23003876

it`a the same thing, just use a asp.label. but don`t "bind" label, use Eval.

if it`a another page, use response.Querystring("cid") in the page load or wherever.

But, did you think to ask another question?

 

by: meeran03Posted on 2008-11-20 at 06:35:01ID: 31518653

thankss

 

by: meeran03Posted on 2008-11-20 at 06:37:08ID: 23004048

ok mate...
i forgot to put this issue combined with this question itself
soon i ll post this new question ...

Thanks ....

 

by: meeran03Posted on 2008-11-20 at 06:42:04ID: 23004116

can u plz explain . why  string.concat is used...??

 

by: davrob60Posted on 2008-11-20 at 06:44:45ID: 23004145

There is many way to concat a string. string.concat is one of them. the & operator is another.

 

by: davrob60Posted on 2008-11-20 at 06:45:34ID: 23004152

& operator, in VB.net...  string.concat is language insensitive...

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