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03.20.2008 at 06:27PM PDT, ID: 23258917

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8.6

Working with SQLDataSource.

Zones: Programming for ASP.NET, Microsoft Visual Basic.Net, .NET Framework 2.0

I have two dropdownlist

One with
Country: DSCountry
Province: DSRegion
=============================================
Country is populated from a table called:
CREATE TABLE [dbo].[CountryCodes](
      [CountryID] [char](2) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [Country] [varchar](1024) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
) ON [PRIMARY]

However when I choose a country I want the dropdownlist for Region to be properly populated.
This means I have to link the two tables some how? I need a start. Any help would be kindly appreciated.

CREATE TABLE [dbo].[SubCountryCode](
      [CountryID] [char](2) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [RegionID] [char](2) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [Region] [varchar](1024) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
) ON [PRIMARY]

         
           
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             This has to be modified as well:
 
 protected void ddlCountry_SelectedIndexChanged(object sender, EventArgs e)
    {
          if (ddlCountry.SelectedValue == "CA") // Canada, set to provinces.
          {
 
              // Get the DropDownList's SelectedIndex                
              int iRow = ddlCountry.SelectedIndex;
          }
    //    else if (ddlCountry.SelectedValue == "US")
    //    {
    //        DataSet DSStateProvince = new DataSet();
    //        DSStateProvince.ReadXml(Server.MapPath("../xmldata/AccountInformation/States.xml")); //Provinces.xml
    //        ddlStateProvince.DataSource = DSStateProvince;
    //        ddlStateProvince.DataTextField = "name";
    //        ddlStateProvince.DataValueField = "stateid"; // provinceid
    //        ddlStateProvince.DataBind();
    //        // Get the DropDownList's SelectedIndex                
    //        int iRow = ddlCountry.SelectedIndex;
    //    }
    //    else if ((ddlCountry.SelectedValue != "US") && (ddlCountry.SelectedValue != "CA"))
    //    {
    //        ddlStateProvince.Items.Clear();
    //        ddlStateProvince.Items.Insert(0, new ListItem("Not Available", "NA"));
    //      }
 
 
    }

           
         

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Question Stats

Zone: Programming

Question Asked By: mathieu_cupryk

Solution Provided By: l-cm

Participating Experts: 2

Solution Grade: A

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03.20.2008 at 06:59PM PDT, ID: 21177583

MaxOvrdrv2:

are you having problems with the SQL or the .Net Code? because the .Net code is fairly simple...

03.20.2008 at 07:00PM PDT, ID: 21177585

mathieu_cupryk:

I having problems with both to get started.
I am not great at this. I need direction.

03.20.2008 at 07:27PM PDT, ID: 21177686

MaxOvrdrv2:

first, you need to tell us a bit more as to what you're using... MySQL, or SQLServer?...

second, the code you have there, in the back-end, pretty much does it code-wise... i think your main problem is getting your 2 tables filled with the right data.

03.20.2008 at 07:33PM PDT, ID: 21177709

Rank: Master

l-cm:

You this as your dropdownlists. You shouldn't need to do anything in the code behind since the data will be populated based on the selected value of the first dropdown and the autopostback is set to true.

                       
         
           
           
             <asp:DropDownList ID="ddlCountry" runat="server" AutoPostBack="True" DataSourceID="SqlDataSource2" DataTextField="Country" DataValueField="CountryID">
</asp:DropDownList>
<asp:DropDownList ID="ddlCountryRegion" runat="server" DataSourceID="SqlDataSource1" DataTextField="Region" DataValueField="RegionID">
</asp:DropDownList>
 
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
            SelectCommand="SELECT [CountryID], [Country] FROM [CountryCodes]">
</asp:SqlDataSource>
 
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
            SelectCommand="SELECT [RegionID], [Region] FROM [SubCountryCode] WHERE ([CountryID] = @CountryID)">
            <SelectParameters>
                <asp:ControlParameter ControlID="ddlCountry" Name="CountryID" PropertyName="SelectedValue"
                    Type="Int32" />
            </SelectParameters>
        </asp:SqlDataSource>

           
         

Open in New Window

03.20.2008 at 07:34PM PDT, ID: 21177718

mathieu_cupryk:

I am using SQL SERVER 2005 with visual studio 2005.
How do I setup my the dropdown for the Region.

I need to populate the Region dropdownlist according to the Country.
Country: DSCountry
Province: DSRegion
=============================================
Country is populated from a table called:
CREATE TABLE [dbo].[CountryCodes](
[CountryID] [char](2) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Country] [varchar](1024) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
) ON [PRIMARY]

However when I choose a country I want the dropdownlist for Region to be properly populated.
This means I have to link the two tables some how? I need a start. Any help would be kindly appreciated.

CREATE TABLE [dbo].[SubCountryCode](
[CountryID] [char](2) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[RegionID] [char](2) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Region] [varchar](1024) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
) ON [PRIMARY]

03.20.2008 at 07:37PM PDT, ID: 21177729

mathieu_cupryk:

This is what I have for country

Country:</strong></span></strong></span></td>
<td colspan="2" style="height: 23px; text-align: left; width: 625px;">
<asp:DropDownList ID="ddlCountry" runat="server" DataTextField="Country" DataValueField="CountryID" DataSourceID="DSCountry">
</asp:DropDownList><asp:SqlDataSource ID="DSCountry" runat="server" ConnectionString="<%$ ConnectionStrings:omegaloveConnectionString %>"
SelectCommand="SELECT [CountryID], [Country] FROM [CountryCodes]"></asp:SqlDataSource>

03.20.2008 at 07:39PM PDT, ID: 21177737

mathieu_cupryk:

cm,
you tell me how I build the other datasource for region. I don;t want to copy and paste.
I want to learn with visual studio 2005 how u did this?

03.20.2008 at 07:39PM PDT, ID: 21177739

Rank: Master

l-cm:

Did you try my code?

If there is no data for in the SubCountryCode for the selected country, there will be no data displayed in the ddlCountryRegion dropdownlist

03.20.2008 at 07:49PM PDT, ID: 21177774

mathieu_cupryk:

Can you tell me how u build this for subcountrycode in visual studio?

03.20.2008 at 07:54PM PDT, ID: 21177789

Rank: Master

l-cm:

If you pull the dropdownlist from the toolbox onto the design of the form for the SubCountryCode there is a wizard that will walk you through setting up your data. Here are the steps.

1) Add dropdownlist to designer
2) Select Choose DataSource from dropdown list task box
3) Select the new datasource option
4) In the "Choose Datasource Type" select database click OK
5) Select New Connection and set up your connectionstring
6) Keep the checkbox selected to add the connectionstring to your web config, select next
7) Now you can specify a procedure or select the data directly from the table
8) If you select the columns from the SubCountryCode and select the "Where..." button
9) This will bring up another dialog that you can select the parameters. Set the Source: equal to control and set the ControlID equal to the ddlCountry dropdownlist. Select Add then OK, then Next
10) Set the field you want to display and the field value. Select OK

Hope I didn't miss any steps for you. Let me know if I was too confusing.

03.20.2008 at 07:56PM PDT, ID: 21177803

Rank: Master

l-cm:

Don't forget to set the AutoPostBack="True" in the ddlCountry dropdownlist so the parameter for the datasource.of the ddlSubCountryCode will automatically populate.

03.20.2008 at 08:00PM PDT, ID: 21177817

mathieu_cupryk:

I am in query builder
SELECT CountryID, RegionID, Region FROM SubCountryCode
what do I do next.
there is add parameter ...

03.20.2008 at 08:06PM PDT, ID: 21177845

mathieu_cupryk:

Ok cm,
I got it working, however, how do I set the initial value of country to Canada?

03.20.2008 at 08:06PM PDT, ID: 21177848

Rank: Master

l-cm:

You need to add a where clause to get all of the region for the specific country code. In query builder set the filter for the CountryID column to "= @CountryID".

Or you can modify the sql statement directly in the query builder by adding " WHERE ([CountryID] = @CountryID)" to the statement "SELECT [RegionID], [Region] FROM [SubCountryCode]"

SQL Query:
SELECT [RegionID], [Region] FROM [SubCountryCode]
WHERE ([CountryID] = @CountryID)

03.20.2008 at 08:08PM PDT, ID: 21177855

mathieu_cupryk:

This is what I have:
<asp:SqlDataSource ID="DSRegion" runat="server" ConnectionString="<%$ ConnectionStrings:omegaloveConnectionString %>"
SelectCommand="SELECT [CountryID], [RegionID], [Region] FROM [SubCountryCode] WHERE ([CountryID] = @CountryID)">
<SelectParameters>
<asp:ControlParameter ControlID="ddlCountry" Name="CountryID" PropertyName="SelectedValue"
Type="String" />
</SelectParameters>
</asp:SqlDataSource>

03.20.2008 at 08:11PM PDT, ID: 21177870

mathieu_cupryk:

Now I have to link it to citys
This should be in theory select city from worldcities where
COUNTRYID = @ COUNTRYID
and REGIONID = @ REGIONID
How should i do this?

                       
             CREATE TABLE [dbo].[WorldCities](
	[CountryID] [char](2) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
	[City] [varchar](1024) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
	[AccentCity] [varchar](1024) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
	[RegionID] [char](2) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
	[Population] [int] NULL,
	[Latitude] [float] NULL,
	[Longitude] [float] NULL
) ON [PRIMARY]

Open in New Window

03.20.2008 at 08:17PM PDT, ID: 21177895

Rank: Master