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How to use user control in a repeater

Posted on 2009-07-15
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Last Modified: 2013-11-05
I have created a user control in ASP.NET that contains 11 different gridviews, each intended to display a different set of people (like a depth chart).  I also have a dropdownlist with 30 items, where each item would have different people in the gridview.  How does one go about using the repeater control to accomplish this?

Adding to the fun:  In the codebehind for the control, I am doing formatting on each entry based upon certain criteria (basically, changing the font color if certain conditions are met).
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Question by:houstonastros
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ddayx10 earned 125 total points
ID: 24865405
1) Setup a databinding routine for your gridview(s)
2) Set dropdownlist property autopostback=true
3) Add selectedindexchanged event to dropdownlist
4) In selectedindexchanged event use the value and/or text to get new data and re-bind to gridview(s).

There's a sample that does that here:
http://www.experts-exchange.com/Programming/Languages/.NET/Q_24481708.html

I'll also past the code below (see snippet).
****ASPX PAGE (could just as easily be ASCX page)****

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

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title>Untitled Page</title>

</head>

<body>

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

	<span>New Title: </span>

	<asp:TextBox ID="txtTitle" runat="server" />

	<asp:Button ID="Button1" runat="server" Text="Add Record" OnClick="Button1_Click" />

	<span>Adds a record to the database.</span>

	<p style="margin: 5px 0px; padding: 0px;">

		Dropdown bound to available id values in database table.</p>

	<asp:DropDownList ID="ddl1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddl1_SelectedIndexChanged">

	</asp:DropDownList>

	<p style="margin: 5px 0px; padding: 0px;">

		GridView shows items with id equal to dropdownlist selected value.</p>

	<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="true">

	</asp:GridView>

	

	</form>

</body>

</html>
 
 

****CODE BEHIND****

using System.Data.SqlClient;
 

public partial class Default4 : System.Web.UI.Page

{

    public string connStr

    {

        get

        {

            string conn = ConfigurationManager.ConnectionStrings["conn"].ToString();

            return conn;
 

        }

    }
 

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            bindToDDL();

            bindToGrid();

        }
 
 

    }
 

    protected void ddl1_SelectedIndexChanged(object sender, EventArgs e)

    {

        bindToGrid();

    }
 

    private void bindToDDL()

    {

        SqlConnection conn = new SqlConnection(connStr);

        SqlCommand cmd = new SqlCommand("SELECT catID,title FROM roLIST", conn);

        conn.Open();

        SqlDataReader dr = cmd.ExecuteReader();

        ddl1.DataTextField = "title";

        ddl1.DataValueField = "catID";

        ddl1.DataSource = dr;

        ddl1.DataBind();

        dr.Close();

        conn.Close();

        conn.Dispose();

        

    }
 
 

    private void bindToGrid()

    {

        SqlConnection conn = new SqlConnection(connStr);

        SqlCommand cmd = new SqlCommand("SELECT * FROM roLIST WHERE catID = @choice",conn);

        cmd.Parameters.Add(new SqlParameter("@choice", Convert.ToInt32(ddl1.SelectedValue)));

        conn.Open();

        SqlDataReader dr = cmd.ExecuteReader();

        GridView1.DataSource = dr;

        GridView1.DataBind();

        dr.Close();

        conn.Close();

        conn.Dispose();

    }
 

    protected void Button1_Click(object sender, EventArgs e)

    {

        SqlConnection conn = new SqlConnection(connStr);

        SqlCommand cmd = new SqlCommand("INSERT INTO roLIST (title, listOrder) VALUES(@title, @listOrder)", conn);

        cmd.Parameters.Add(new SqlParameter("@title", txtTitle.Text.ToString()));

        cmd.Parameters.Add(new SqlParameter("@listOrder", Convert.ToInt32(ddl1.Items.Count)+1));

        conn.Open();

        cmd.ExecuteNonQuery();

        conn.Close();

        conn.Dispose();

        bindToDDL();

        bindToGrid();
 

    }

}

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