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asp.net, jquery

if i have asp.net dropdown like below and when I select something, the city and state will be populated from the dsm dropdown, is it possible in .net/c#/code behind? Thanks

<asp:DropDownList Width="200" runat="server" ID="dsm" DataSourceID="SqlDataSourceDsm"
            DataTextField="Description" DataValueField=">
<asp:ListItem Text="Address" Value="Address,City,State,Zip"></asp:ListItem>
</asp:DropDownList>

<asp:TextBox runat="server" ID="address"></asp:TextBox>
<asp:TextBox runat="server" ID="city"></asp:TextBox>
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ITsolutionWizard
Asked:
ITsolutionWizard
1 Solution
 
Najam UddinCommented:
yeah, if you are willing to post back or make ajax call
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ITsolutionWizardAuthor Commented:
can you show me in codes for both method?
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Manoj PatilSr. Software EngineerCommented:
Hi check this code

ASPX PAGE CODE

 <%@ Register Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit" tagPrefix="ajax" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="scriptmanager1" runat="server"></asp:ScriptManager>
<div>
<table>
<tr>
<td>
Select Country:
</td>
<td>
<asp:DropDownList ID="ddlcountry" runat="server"></asp:DropDownList>
<ajax:CascadingDropDown ID="ccdCountry" runat="server" Category="Country" TargetControlID="ddlcountry" PromptText="Select Country" LoadingText="Loading Countries.." ServiceMethod="BindCountryDetails" ServicePath="CascadingDropdown.asmx">
</ajax:CascadingDropDown>
</td>
</tr>
<tr>
<td>
Select State:
</td>
<td>
<asp:DropDownList ID="ddlState" runat="server"></asp:DropDownList>
<ajax:CascadingDropDown ID="ccdState" runat="server" Category="State" ParentControlID="ddlcountry" TargetControlID="ddlState" PromptText="Select State" LoadingText="Loading States.." ServiceMethod="BindStateDetails" ServicePath="CascadingDropdown.asmx">
</ajax:CascadingDropDown>
</td>
</tr>
<tr>
<td>
Select Region:
</td>
<td>
<asp:DropDownList ID="ddlRegion" runat="server"></asp:DropDownList>
<ajax:CascadingDropDown ID="ccdRegion" runat="server" Category="Region" ParentControlID="ddlState" TargetControlID="ddlRegion" PromptText="Select Region" LoadingText="Loading Regions.." ServiceMethod="BindRegionDetails" ServicePath="CascadingDropdown.asmx">
</ajax:CascadingDropDown>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

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After that add one new webservice page to your application and following namcespaces in your webservice code behind page
 using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Configuration;
using AjaxControlToolkit;

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Here we need to remember one point that is we need to write webmethods this format only and use exact parameters that should be same as whatever I mentioned in web method
 [WebMethod]
public CascadingDropDownNameValue[] BindCountryDetails(string knownCategoryValues,string category)

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 In this web method we have a chance to change only method name return type also same CascadingDropDownNameValue[]
After completion of writing namespaces and write the following code in webservice page

 /// <summary>
/// Summary description for CascadingDropdown
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService()]
public class CascadingDropdown : System.Web.Services.WebService
{
//Database connection string
private static string strconnection = ConfigurationManager.AppSettings["ConnectionString"].ToString();
//database connection
SqlConnection concountry = new SqlConnection(strconnection);
public CascadingDropdown () {

//Uncomment the following line if using designed components
//InitializeComponent();
}
/// <summary>
/// WebMethod to Populate COuntry Dropdown
/// </summary>
[WebMethod]
public CascadingDropDownNameValue[] BindCountryDetails(string knownCategoryValues,string category)
{
concountry.Open();
SqlCommand cmdcountry = new SqlCommand("select * from CountryTable", concountry);
cmdcountry.ExecuteNonQuery();
SqlDataAdapter dacountry = new SqlDataAdapter(cmdcountry);
DataSet dscountry = new DataSet();
dacountry.Fill(dscountry);
concountry.Close();
//create list and add items in it by looping through dataset table
List<CascadingDropDownNameValue> countrydetails = new List<CascadingDropDownNameValue>();
foreach(DataRow dtrow in dscountry.Tables[0].Rows)
{
string CountryID = dtrow["CountryID"].ToString();
string CountryName = dtrow["CountryName"].ToString();
countrydetails.Add(new CascadingDropDownNameValue(CountryName, CountryID));
}
return countrydetails.ToArray();
}
/// <summary>
/// WebMethod to Populate State Dropdown
/// </summary>
[WebMethod]
public CascadingDropDownNameValue[] BindStateDetails(string knownCategoryValues,string category)
{
int countryID;
//This method will return a StringDictionary containing the name/value pairs of the currently selected values
StringDictionary countrydetails =AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
countryID = Convert.ToInt32(countrydetails["Country"]);
concountry.Open();
SqlCommand cmdstate = new SqlCommand("select * from StateTable where CountryID=@CountryID", concountry);
cmdstate.Parameters.AddWithValue("@CountryID", countryID);
cmdstate.ExecuteNonQuery();
SqlDataAdapter dastate = new SqlDataAdapter(cmdstate);
DataSet dsstate = new DataSet();
dastate.Fill(dsstate);
concountry.Close();
//create list and add items in it by looping through dataset table
List<CascadingDropDownNameValue> statedetails = new List<CascadingDropDownNameValue>();
foreach (DataRow dtrow in dsstate.Tables[0].Rows)
{
string StateID = dtrow["StateID"].ToString();
string StateName = dtrow["StateName"].ToString();
statedetails.Add(new CascadingDropDownNameValue(StateName, StateID));
}
return statedetails.ToArray();
}
/// <summary>
/// WebMethod to Populate Region Dropdown
/// </summary>
[WebMethod]
public CascadingDropDownNameValue[] BindRegionDetails(string knownCategoryValues, string category)
{
int stateID;
//This method will return a StringDictionary containing the name/value pairs of the currently selected values
StringDictionary statedetails = AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
stateID = Convert.ToInt32(statedetails["State"]);
concountry.Open();
SqlCommand cmdregion = new SqlCommand("select * from RegionTable where StateID=@StateID", concountry);
cmdregion.Parameters.AddWithValue("@StateID", stateID);
cmdregion.ExecuteNonQuery();
SqlDataAdapter daregion = new SqlDataAdapter(cmdregion);
DataSet dsregion = new DataSet();
daregion.Fill(dsregion);
concountry.Close();
//create list and add items in it by looping through dataset table
List<CascadingDropDownNameValue> regiondetails = new List<CascadingDropDownNameValue>();
foreach (DataRow dtrow in dsregion.Tables[0].Rows)
{
string RegionID = dtrow["RegionID"].ToString();
string RegionName = dtrow["RegionName"].ToString();
regiondetails.Add(new CascadingDropDownNameValue(RegionName, RegionID));
}
return regiondetails.ToArray();
}
}

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Here is the source of this code. You can download a sample code also.
http://www.aspdotnet-suresh.com/2011/01/introduction-here-i-will-explain-how-to.html
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