add where condition in linq datasource at load time and change when dropdown value change

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XML

<h3 align="center">
               City :
               <asp:DropDownList ID="ddlCity" runat="server">
               </asp:DropDownList>
           </h3>
<asp:LinqDataSource
    ContextTypeName="ExampleDataContext"
    TableName="Products"
    Where="Price>@UserPrice"
    ID="LinqDataSource1"
    runat="server">

</asp:LinqDataSource>
<asp:GridView
    DataSourceID="LinqDataSource1"
    ID="GridView1"
    runat="server">
 <Columns>
<asp:BoundField DataField="city" HeaderText="City" SortExpression="city" ReadOnly="true" />
&lt;/Columns&gt;
</asp:GridView>

Posted 28-Apr-11 1:04am

Vineet_2109

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Vineet_2109 28-Apr-11 7:06am

If i select cityname from dropdown it should show all data in grid with that particular selected city....

2 solutions

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nit_singh · Answer 1 · 2011-04-28T01:10:00

Solution 1

Did you tried like this

LinqDataSource1.Where = ddlCity.SelectedItem.value;
LinqDataSource1.WhereParameters.Add("name1", "value1");

Posted 28-Apr-11 1:10am

nit_singh

Comments

Vineet_2109 28-Apr-11 7:13am

LinqDataSource1.WhereParameters.Add("name1", "value1");

What this "name1" and "value1" contains .. ??? can you specify .. ?

m@dhu 28-Apr-11 7:20am

name is the parmeter and value is the value for that parameter.

Vineet_2109 28-Apr-11 7:22am

its like i want by city ..in database there is column name city so what would be parameter and value .. ???

nit_singh 28-Apr-11 7:25am

then it iwll became like LinqDataSource1.WhereParameters.Add("city", "cityValue");

m@dhu · Answer 2 · 2011-04-28T01:17:00

Solution 2

1)Set autopostback for dropdownlist to true.

XML

<asp:DropDownList ID="ddlCity" runat="server" autopostback="True"> 
              </asp:DropDownList>

2)In dropdown list selectedindexchanged event set the where property of LinkDatasource1.
Look at nit_singh answer.

Posted 28-Apr-11 1:17am

m@dhu