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LinkButton ,Label inside Repeater – ASP.NET

Hello All

Today I will show you how to fire Link Button’s event with argument and initialize a label inside of a repeater. To do that first we have to take LinkButton and a Label control inside the ItemTemplate of the repeater. Then we have to initialize the the Label from OnItemDataBound event of the repeater. In the following code blocks its shown how to perform the job.

Following is my Default.aspx file:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="TestProject._Default" %>

<!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></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        Selected ID:<asp:Label ID="lblSelectedID" runat="server" Text=""></asp:Label>
        <br />
        <asp:Repeater ID="rptContent" runat="server" OnItemDataBound="rptContent_ItemDataBound">
            <ItemTemplate>
                <asp:Label ID="lblName" runat="server">
                </asp:Label>
                <asp:LinkButton ID="lnkShowData" runat="server" OnCommand="LinkButton_Command" CommandArgument='<%# Eval("key") %>'
                    Text="[Show]" CommandName="Show"></asp:LinkButton>
                <br />
            </ItemTemplate>
        </asp:Repeater>
    </div>
    </form>
</body>
</html>

In the above code I have bind the "key" as CommandArgument in LinkButton which will be initialize form the code behind file.

My code behind is as following:

using System;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace TestProject
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            rptContent.DataSource = this.userInformation();
            rptContent.DataBind();
        }

       // Fire the link button event from inside repeater.
       protected void LinkButton_Command(object sender, CommandEventArgs e)
        {
           lblSelectedID.Text = e.CommandArgument.ToString();
        }

        protected void rptContent_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            // find the label control by id
            Label lblDynaLabel = (Label)(e.Item.FindControl("lblName"));

            // bind the data from repeater data source (value from the dictionary)with the label control.
            lblDynaLabel.Text = DataBinder.Eval(e.Item.DataItem,"value").ToString();
        }

        #region Private method

        private Dictionary<int, string> userInformation()
        {
            Dictionary<int, string> userData = new Dictionary<int, string>();

            userData.Add(1, "Max");
            userData.Add(2, "Top");
            userData.Add(3, "Avg");

            return userData;
        }
        #endregion
    }
}

The output will be as bellow:

Selected ID:1
Max [Show]
Top [Show]
Avg [Show]

In the private method section I have created a simple mathod named userInformation, which contains dictionary data collection to bind it with repeater.Hope that above code blocks will help.

Thanks

That’s all for the day.

BYE

User ScrumPad for your Agile based projects.

Posted by Tanvir on June 12, 2009 at 7:26 pm under ASP.NET, C#, Event, Visual Studio.
3 Comments.

Print C# properties in aspx,ascx page from code behind file.

Hello all

Today I will show you how to print something in aspx or ascx page from code behind file.In this example I have taken a “Web User Control” named “WebUserControl.ascx”. What I wanted to do was, print a value of a variable in “.ascx” page where the variable has been initialize from “.ascx.cs” better to say code behind file.

To do that we have taken a property in “WebUserControl.ascx.cs” code behind file named “PrintValue” and make it a public property and assign a string value on PageLoad event as bellow :

using System;

public partial class WebUserControl : System.Web.UI.UserControl
{
    public string PrintValue { get; set; }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
            PrintValue = "Postback";
        else
            PrintValue = "Not postback";
    }
}

Now I have printed the value of the property in my “WebUserControl.ascx” page as bellow.One thing we have to remember that the script tag should be like : <%= %> to print something in it.

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="WebUserControl" %>

The page has - <%= PrintValue %>

Now we can use the control in our page to show the state of the page.
Thats all for today.
Bye

User ScrumPad for your Agile based projects.

Posted by Tanvir on May 28, 2009 at 8:43 am under ASP.NET, C#.
Comment on this post.

File streaming in .NET

Hello All

Today i will focus on simple file steaming in .NET which I have to implement it in one of my project.Though it’s not optimize but its OK for serve small purpose.

In the project I have to read a PDF file from the server and with FileStream and Flash it with Response to the client side.

the code is as bellow.

private void generateRequestedPDF()
{
    try
    {
        string file = Path.GetFileName(Request.QueryString["RefID"]);// get file name from query string.use your custom method." 

        FileStream fileStream = new FileStream(Server.MapPath(@"~\uploadedFiles\" + file), FileMode.Open);
        long fileSize = fileStream.Length;

        byte[] buffer = new byte[(int)fileSize];
        fileStream.Read(buffer, 0, (int)fileSize);
        fileStream.Close();

        Response.Clear();

        Response.ContentType = "Application/pdf";// use your custom type"
        Response.AddHeader("Content-Disposition", "inline; filename=" + file);

        Response.OutputStream.Write(buffer, 0, (int)fileSize);
        Response.Flush();
        Response.Close();
    }
    catch (Exception exc)
    {
    //  throw exc;
        this.writeLogWarn(exc);
        Response.Redirect("~/Pages/Content/TechCorner.aspx");
    }

}