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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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