Cascading Dropdownlist in Asp.net Gridview with Example

By: Suresh Dasari Nov 4, 2014

Introduction:

Here I will explain how to implement cascading dropdownlist in gridview using asp.net with example or implement Ajax cascading dropdownlist in gridview using asp.net in c#.

Description:

In Previous posts I explained clearly jQuery cascading dropdownlist example in asp.net, how to implement ajax cascading dropdownlist using asp.net and lot of articles regarding Gridview. Now I will explain how to implement cascading dropdown list in gridview using asp.net. Here I am using previous implemented article ajax cascading dropdownlist in asp.net to bind data to dropdownlists.

After that I am binding the data to gridview for that first design table in database and give name UserInfomation

ColumnName	DataType
UserId	Int(set identity property=true)
UserName	varchar(50)
LastName	varchar(50)
Location	varchar(50)

After completion table creation add ajax reference to your application because here I am using ajax cascading dropdownlists bind to gridview and design your aspx page like this

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajax" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<title>Cascading Dropdownlist Sample</title>

</head>

<body>

<ajax:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"/>

<div>

<asp:GridView runat="server" ID="gvdetails" DataSourceID="dsdetails" AllowPaging="true" PageSize="10" AutoGenerateColumns="false" ShowFooter="true">

<asp:TemplateField HeaderText="UserId">

<asp:Label ID="lblUserId" runat="server" Text='<%#Eval("UserId") %>'/>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="UserName">

<asp:Label ID="lblUserName" runat="server" Text='<%#Eval("UserName") %>'/>

</ItemTemplate>

<asp:DropDownList ID="ddlCountry" runat="server"></asp:DropDownList>

<ajax:CascadingDropDown ID="CountryCascading" runat="server" Category="Country" TargetControlID="ddlCountry" LoadingText="Loading Countries..." PromptText="Select Country" ServiceMethod="BindCountrydropdown" ServicePath="DropdownWebService.asmx">

</ajax:CascadingDropDown>

</FooterTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="LastName">

<asp:Label ID="lblLastName" runat="server" Text='<%#Eval("LastName") %>'/>

</ItemTemplate>

<asp:DropDownList ID="ddlState" runat="server"></asp:DropDownList>

<ajax:CascadingDropDown ID="StateCascading" runat="server" Category="State" TargetControlID="ddlState" ParentControlID="ddlCountry" LoadingText="Loading States..." PromptText="Select State" ServiceMethod="BindStatedropdown" ServicePath="DropdownWebService.asmx">

</ajax:CascadingDropDown>

</FooterTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="Location">

<asp:Label ID="lblLocation" runat="server" Text='<%#Eval("Location") %>'/>

</ItemTemplate>

<asp:DropDownList ID="ddlregion" runat="server"></asp:DropDownList>

<ajax:CascadingDropDown ID="RegionCascading" runat="server" Category="Region" TargetControlID="ddlregion" ParentControlID="ddlState" LoadingText="Loading Cities..." PromptText="select" ServiceMethod="BindRegiondropdown" ServicePath="DropdownWebService.asmx">

</ajax:CascadingDropDown>

</FooterTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

<asp:SqlDataSource ID="dsdetails" runat="server" ConnectionString="<%$ConnectionStrings:dbconnection %>"

SelectCommand="select * from UserInformation"/>

</div>

</form>

</body>

</html>

If you observe above code I used ajax cascading dropdownlist to bind in gridview. To bind data to dropdownlist and data tables design check this post ajax cascading dropdownlist using asp.net .After completion of bind data to dropdownlists use above code to place dropdownlist in gridview and bind data to gridview if you have any doubts just download the attached code to and check the details.

Here don’t forgot to set the connection string in web.config file here I am getting database connection from web.config file for that reason you need to set the connectionstring in web.config file like this