populating dropdownlist with parent child relation using LINQ

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hi,
i want to bind the two dropdownlist and 2nd dropdownlist data must be based on the first dropdownlist selection that is parent-child relation i want do this using LINQ query

plz provide me code or example to do this process

Thanks inadvance

Posted 11-May-12 0:26am

pradeep manne

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Sandeep Mewara 11-May-12 9:59am

Did you try anything?

2 solutions

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thursunamy · Accepted Answer · 2012-05-11T05:09:00

I prepared a scenario for players and teams. I have written classes below

C#

[Serializable]
    public class Team
    {
        public string Name { get; set; }

    }

SQL

[Serializable]
   public class Player
   {
       public Team Team { get; set; }
       public string Name { get; set; }

       public override string ToString()
       {
           return this.Name;
       }

   }

My WebForm code is below.

XML

<body>
    <form id="form1" runat="server">
    <div>

        <table class="style1">
            <tr>
                <td>
                    Teams</td>
                <td>
                    <asp:DropDownList ID="ddlTeam" runat="server"
                        onselectedindexchanged="ddlTeam_SelectedIndexChanged" AutoPostBack="True">
                    </asp:DropDownList>
                </td>
            </tr>
            <tr>
                <td>
                    Players</td>
                <td>
                    <asp:DropDownList ID="ddlPlayer" runat="server">
                    </asp:DropDownList>
                </td>
            </tr>
            <tr>
                <td>
                    &nbsp;</td>
                <td>
                    <asp:Literal ID="ltResult" runat="server"></asp:Literal>
                </td>
            </tr>
        </table>

    </div>
    </form>
</body>

and the codebehind is below. This is the example I stored my data on ViewState so I marked my classes as Serializable.

C#

protected void Page_Load(object sender, EventArgs e)
        {
            if (IsPostBack) return;
            FillTeam();
        }

C#

private void FillTeam()
       {
           Team t1 = new Team { Name = "Barcelona" };
           Team t2 = new Team { Name = "Milan" };
           Team t3 = new Team { Name = "Bayern Munchen" };

           List<Player> players = new List<Player>();
           players.Add(new Player { Team = t1, Name = "Xavi" });
           players.Add(new Player { Team = t1, Name = "Iniesta" });
           players.Add(new Player { Team = t1, Name = " Busquets" });
           players.Add(new Player { Team = t2, Name = "Ibrahimovic" });
           players.Add(new Player { Team = t2, Name = "Gattuso" });
           players.Add(new Player { Team = t2, Name = "Robinho" });
           players.Add(new Player { Team = t2, Name = "Pato" });
           players.Add(new Player { Team = t3, Name = "Ribery" });
           players.Add(new Player { Team = t1, Name = "Robben" });

           ViewState["players"] = players;


           ddlTeam.Items.Add("Choose...");
           ddlTeam.Items.Add(new ListItem { Text = t1.Name });
           ddlTeam.Items.Add(new ListItem { Text = t2.Name });
           ddlTeam.Items.Add(new ListItem { Text = t3.Name });


           ddlTeam.SelectedIndex = 0;
       }

C#

protected void ddlTeam_SelectedIndexChanged(object sender, EventArgs e)
        {
            List<Player> players = (List<Player>)ViewState["players"];
            if (null != players)
            {
                //var playerinTeams = players.Where(p => p.Team.Name == ddlTeam.SelectedItem.Text);
                var playerinTeams = from player in players
                                    where player.Team.Name == ddlTeam.SelectedItem.Text
                                    select player;
                ddlPlayer.DataSource = playerinTeams;
                ddlPlayer.DataBind();

            }
        }

}

pradeep manne · Accepted Answer · 2012-05-11T05:54:00

Solution 2

hi ,
follow below link

http://elidotnet.blogspot.in/2010/10/cascading-drop-down-list-using-aspnet.html[^]

Posted 11-May-12 5:54am