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Dynamically give Id to button, Commandargument send value

Here is my part of Shop.aspx code:
<% foreach(var item in items){ %>
...
<asp:Button id="btnBuy" runat="server" class="btn" Text="Buy" OnClick ="btnBuy_Click" CommandArgument='<%#Eval("item.id") %>' />
<% } %>
I've got a loop where I create few buttons to my shopping items, and I need them to have id of my item
protected void btnBuy_Click(object sender, EventArgs e)
{
int itemId = Convert.ToInt32(btnBuy.CommandArgument);
}
On click i need to have id of the item/button clicked, to save them later in my database.
Problem -
When i click on button btnbuy.CommandArgument is "".

It's wrong: you wrote c#in asp style. You have to use a Repeater and then you can manage ItemCommand for every button click.
Aspx
<asp:Repeater ID="myRepeater" runat="server" OnItemCommand="myRepeater_ItemCommand">
<ItemTemplate>
<asp:Label id="myLbl" runat="server" Text='<%# ((Item)(Container.DataItem)).ProductName %>'/>
<asp:Button id="btnBuy" runat="server" CssClass="btn" Text="Buy" CommandName="Click" CommandArgument='<%# ((Item)(Container.DataItem)).ProductId %>' />
</ItemTemplate>
</asp:Repeater>
c# (eg. OnLoad)
List<Item> myCollection = ...; // get list of items
myRepeater.DataSource = myCollection;
myRepeater.DataBind();
...
protected void myRepeater_ItemCommand(Object sender, RepeaterCommandEventArgs e)
{
if(e.CommandName == "Click")
{
int idRecord = Convert.ToInt32(e.CommandArgument);
// do something using idRecord or
// get sender properties: ((Button)e.CommandSource).Text
}
}

Setting ImageSrc for each template

So I am in a confusing situation right now, I have a ListView with an ItemTemplate that contains an Image element:
<asp:ListView ID="ListView1" runat="server">
<ItemTemplate>
<asp:Image ID="Image1" class="main" runat="server" ImageUrl='<%# Eval("photo1") %>' />
</ItemTemplate>
</asp:ListView>
In my click event I have the following code:
protected void btn_search_Click(object sender, EventArgs e)
{
var img = ListView1.Items[0].FindControl("Image1") as Image;
var lbl = ListView1.Items[0].FindControl("lbl_ID") as Label;
string image = img.ImageUrl;
foreach (ListViewItem item in ListView1.Items)
{
if (img.ImageUrl == "defaultcar.jpg")
{
img.ImageUrl = "images/defaultcar.jpg";
}
else
{
img.ImageUrl = "images/" + "44/" + image;
}
}
}
So in my DB I have 2 images, one called "defaultcar.jpg" and another called "car.jpg" what I am trying to do is create the correct path for each image, I have debugged everything and it seems the first ItemTemplate is displaying "images/44/defaultcar.jpg" and the second ItemTemplate is displaying "car.jpg", it should be the other way round, "images/44/car.jpg" and "images/defaultcar.jpg"
does anyone know what I am doing wrong?

If I understand your issue, you can solve it as below:
First create method to return Image url like:
protected string GetImageUrl(object imageUrl)
{
if(imageUrl == null)
return "";
if(imageUrl.ToString() == "defaultcar.jpg")
return = "images/defaultcar.jpg";
else
return "images/44/" + imageUrl.ToString();
}
Then update .aspx file:
<asp:Image ID="Image1" class="main" runat="server" ImageUrl='<%# GetImageUrl(Eval("photo1")) %>' />

How to change the layout of QueryableFilterRepeater?

I am using an ASP.NET Dynamic Data Entities web application which contains a QueryableFilterRepeater server control inside the content placeholder on page List.aspx, when I execute the website, the filter control shows all the filters (Label Name along with the corresponding Drop Down) vertically.
Is there any way we can change the layout and display the filters horizontally?
Please find the .aspx code below
<asp:QueryableFilterRepeater runat="server" ID="FilterRepeater">
<ItemTemplate>
<asp:Label runat="server" Text='<%# Eval("DisplayName") %>' OnPreRender="Label_PreRender" />
<asp:DynamicFilter runat="server" ID="DynamicFilter" OnFilterChanged="DynamicFilter_FilterChanged" />
</ItemTemplate>
</asp:QueryableFilterRepeater>
The corresponding .cs file code:-
protected void Label_PreRender(object sender, EventArgs e)
{
Label label = (Label)sender;
DynamicFilter dynamicFilter = (DynamicFilter)label.FindControl("DynamicFilter");
QueryableFilterUserControl fuc = dynamicFilter.FilterTemplate as QueryableFilterUserControl;
if (fuc != null && fuc.FilterControl != null)
{
label.AssociatedControlID = fuc.FilterControl.GetUniqueIDRelativeTo(label);
}
}
protected void DynamicFilter_FilterChanged(object sender, EventArgs e)
{
GridView1.PageIndex = 0;
}
Need suggestions.
Thanks in advance.

I usually wrap the control in a span element and then use CSS to style it the way that i want:
<asp:QueryableFilterRepeater runat="server" ID="FilterRepeater">
<ItemTemplate>
<span class="filter">
<asp:Label runat="server" Text='<%# Eval("DisplayName") %>' OnPreRender="Label_PreRender" />
<asp:DynamicFilter runat="server" ID="DynamicFilter" OnFilterChanged="DynamicFilter_FilterChanged"/>
</span>
</ItemTemplate>

how to get image url on click in repeater

i want to get image url on clicking the image from database in repeater
my database contains(id,url)
my repeater code is:
<asp:Repeater runat="server" ID="repeater" >
<ItemTemplate >
<asp:ImageButton runat="server" Width="200px" Height="200px" ImageUrl='<%#Eval("url") %>' OnCommand="Image_Click" CommandName="ImageClick" CommandArgument='<%#Eval("url") %>' />
</ItemTemplate>
</asp:Repeater>
my .cs code is
protected void Image_Click(object sender, CommandEventArgs e)
{
if (e.CommandName == "ImageClick")
{
string a=e.CommandArgument.tostring();
responce.write(a);
}
}

you can do in ImageClick
((ImageButton)sender).ImageUrl
to get the url of the clicked button

Cast sender to ImageButton and read its ImageUrl property.
Also, is there a reason you are using command instead of handling ImageButtons click event?

Both Vladimir and Guigui answers are prefer way of accessing URL of an image button.
If you also want ID value in addition to URL, you can store multiple values into CommandArgument separated by comma.
<asp:ImageButton runat="server"
ImageUrl='<%#Eval("url") %>'
OnCommand="Image_Command"
CommandName="ImageClick"
CommandArgument='<%# Eval("Id")%> + "," + Eval("url") %>' />
protected void Image_Command(object sender, CommandEventArgs e)
{
if (e.CommandName == "ImageClick")
{
string[] commandArgs = e.CommandArgument.ToString()
.Split(',');
string id = commandArgs[0];
string url = commandArgs[1];
}
}

Creating a query string when clicking on image (asp.net/c#)

My application is an image gallery and with a Repeater control i'm listing the thumbnails (that's in a separate folder, apart from the full scale images). When clicking on a thumbnail a full scale image should be shown in the Image control "fullSizeImage" and a query string should be created which (with a GET of the page) shows that specific image in full scale.
The code for the query string is done, but the problem is that I don't have a clue where to put it (the creation of the query), because the HyperLink control doesn't support event clicks. Is there a way to use for example Repeater ItemCommand, or how could I accomplish what I want here?
Thanks!
from default.aspx:
<asp:Image ID="fullSizeImage" runat="server" />
<asp:Repeater ID="ImageRepeater" runat="server" DataSourceID="" >
<ItemTemplate>
<asp:HyperLink ID="ImageHyperLink" NavigateUrl='<%# Eval("Name", "~/Images/{0}") %>' runat="server" CssClass="thumbnails" >
<asp:Image ID="Image1" runat="server" ImageUrl='<%# Eval("Name", "~/Images/Thumbnails/{0}") %>' CssClass="thumbnail" />
</asp:HyperLink>
</ItemTemplate>
</asp:Repeater>
from code behind:
protected void Page_Load(object sender, EventArgs e) {
var directory = new DirectoryInfo(Gallery.PhysicalApplicationPath + "/Images");
var theFiles = directory.GetFiles();
ImageRepeater.DataSource = theFiles;
ImageRepeater.DataBind();
var dataName = Request.QueryString["name"];
fullSizeImage.ImageUrl = dataName;
}
the creation of the query string (that I don't know where to put):
string str = ImageUrl; <- the url of the clicked image
Response.Redirect("default.aspx?name=" + Server.UrlEncode(str);

This works with me
<asp:HyperLink ID="ImageHyperLink" NavigateUrl='<%# "~/default.aspx?name=" + Server.UrlEncode(Eval("Name","~/Images/{0}")) %>' runat="server" CssClass="thumbnails" >
<asp:Image ID="Image1" runat="server" ImageUrl='<%# Eval("Name", "~/Images/Thumbnails/{0}") %>' CssClass="thumbnail" />
</asp:HyperLink>

In the code behind you can set up a method tied to the Repeater's ItemDataBound event. In that method you can retrieve the current file, find the HyperLink, and set the link's NavigateUrl to be the string you are generating. Something like the following:
ImageRepeater.ItemDataBound += new RepeaterItemEventHandler(ImageRepeater_ItemDataBound);
private void ImageRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
[File] f = (File)e.Item.DataItem;
HyperLink ImageHyperLink = (HyperLink)e.Item.FindControl("ImageHyperLink");
string str = f.ImageUrl;
ImageHyperLink.NavigateUrl = "default.aspx?name=" + Server.UrlEncode(str);
}