Develop Reference

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
}
}

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>

C# delete item from listview from control outside listview

From a listview control, when checkboxes are checked and a button is clicked from outside the listview, I need to be able to delete the items that have been checked. Here's the listview:
EDIT
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack) return;
var notes = (from n in db.Notes
select n).OrderBy(n => n.FiscalYear).ThenBy(n => n.Period);
notesListView.DataSource = notes;
notesListView.DataBind();
}
<asp:ListView ID="notesListView" ItemPlaceholderID="itemPlaceholder" runat="server">
<LayoutTemplate>
<div>
<asp:PlaceHolder ID="itemPlaceholder" runat="server"></asp:PlaceHolder>
</div>
</LayoutTemplate>
<ItemTemplate>
<asp:CheckBox ID="checkNote" runat="server" />
<div><%# Eval("Period") %></div>
<div><%# Eval("FiscalYear") %></div>
<div><%# Eval("Account") %></div>
<div class="wrap"><%# Eval("Description") %></div>
</ItemTemplate>
<EmptyDataTemplate>
<div>No notes have been submitted.</div>
</EmptyDataTemplate>
</asp:ListView>
<br />
<asp:Button ID="deleteNotes" CssClass="deleteButton" Text="Delete Notes" runat="server" OnClick="deleteNotes_Click" />
Here's the code behind:
protected void deleteNotes_Click(object sender, EventArgs e)
{
foreach (ListViewItem item in notesListView.Items)
{
// I know this is wrong, just not sure what to do
if (notesListView.SelectedIndex >= 0)
{
CheckBox ck = (CheckBox)item.FindControl("checkNote");
if (ck.Checked)
{
var index = item.DataItemIndex; // the item row selected by the checkbox
// db is the datacontext
db.Notes.DeleteOnSubmit(index);
db.SubmitChanges();
}
}
else
{
errorMessage.Text = "* Error: Nothing was deleted.";
}
}
}

You need to find the object before deleting it. To do so, I would add a hiddenfield to store NoteID like this:
<asp:HiddenField ID="hdnId" Value='<%#Eval("Id")%>' runat="server" />
<asp:CheckBox ID="checkNote" runat="server" />
... ... ...
And in my code I am finding the note by ID and deleting that note (You may use any other unique field instead of ID). My code may look like this:
... ... ...
int id = 0;
var hdnId = item.FindControl("hdnId") as HiddenField;
CheckBox ck = (CheckBox)item.FindControl("checkNote");
//I would check null for ck
if (ck != null && ck.Checked && hdnId != null && int.TryParse(hdnId.Value, out id)
{
// db is the datacontext
Note note = db.Notes.Single( c => c.Id== id );
db.Notes.DeleteOnSubmit(note );
db.SubmitChanges();
}

Repeater in ASP.net

I used repeater in asp.net. My problem is don't know how to hide a fields in repeater. There is a regular price and now price if regular price is equal to zero it will hide the fields and if not it will show the value of the regular price. i hope you can help on this.
here my code in asp:
<a href="<%=Utility.GetSiteRoot() %>/BookInfo.aspx?SKU=<%# Utility.SKUMask(Eval("lb_sku").ToString()) %>">
<img width="150px" src='<%# Eval("lb_picturepath")%>'>
</td>
<td valign="top">
<asp:Label ID="lb_titleLabel" runat="server" CssClass="center-head" Text='<%# Eval("lb_title") %>' />
<p><asp:Label ID="lb_descriptionLabel" runat="server" Text='<%# Eval("lb_description") %>' /></p>
<div class="price"><%# "Price: " + decimal.Round((decimal)Eval("lb_sellingprice"),2)%></div>
</td>
</tr>
<tr>
<td></td>
<td>
<a class="addtocart" href="<%=Utility.GetSiteRoot() %>/AddToCart.aspx?SKU=<%# Utility.SKUMask(Eval("lb_sku").ToString()) %>" >Add To Cart</a>
<a href="<%=Utility.GetSiteRoot() %>/BookInfo.aspx?SKU=<%# Utility.SKUMask(Eval("lb_sku").ToString()) %>" class="readmore">
View Details
</a></td>
thanks!

You would need to handle the OnItemDataBound event, and then change the visibility of the control. An example of this is shown below:
ASPX Page
<asp:Repeater ID="MyRepeater" OnItemDataBound="MyRepeater_OnItemDataBound" runat="server">
<ItemTemplate>
<asp:Label ID="RegularPriceLabel" runat="server" />
<br/>
<asp:Label ID="BuyNowPriceLabel" runat="server" />
</ItemTemplate>
</asp:Repeater>
Code Behind
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
MyRepeater.DataSource = GetDataSource();
MyRepeater.DataBind();
}
}
protected void MyRepeater_OnItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
// This will be your data object
MyEntity o = (MyEntity) e.Item.DataItem;
// Get the labels
Label RegularPriceLabel = (Label) e.Item.FindControl("RegularPriceLabel");
Label BuyNowPriceLabel = (Label) e.Item.FindControl("BuyNowPriceLabel");
// Only show regular price if it is set
RegularPriceLabel.Visible = (o.RegularPrice > 0);
// Populate labels
RegularPriceLabel.Text = o.RegularPrice.ToString();
BuyNowPriceLabel.Text = o.BuyNowPrice.ToString();
}
}

I would take a look at the ItemDataBound event of the Repeater. It will fire for every item in the repeater and allow you to do any code-behind (like hiding labels) more easily.
Edit: For your specific example, since you are formatting the price as well, it may be easier to just call a custom method to to render the price, like so:
ASPX:
<%#RenderPrice((decimal)Eval("lb_sellingprice"))%>
Method:
protected string RenderPrice(decimal price) {
if (price > 0) {
return "Price: $" + decimal.Round(price);
} else {
return string.Empty;
}
}
It's quick-and-dirty but it works.

If statement in repeater

I have this repeater on my page..Under the default column what I want is that there
should be an IF condition that checks my table's "IsDEfault" field value.
If IsDefault=True then the lable below "label1" ie "Yes" should be
displayed inside the repeater else "Make DEfault" link should be displayed..
Now how do I include this IF statement as inline code in my repeater to accomplish what I want ?
<asp:LinkButton ID="lnk1" Text="Make Default" CommandName="SetDefault" runat="server" Visible="True" CommandArgument='<%#Eval("UserID") %>' CausesValidation="false"></asp:LinkButton>
<asp:Label ID="label1" Text="Yes" runat="server" Visible="False"></asp:Label>
I have an idea :-
<%# If DataBinder.Eval(Container.DataItem,"IsDefault") = "True"
Then%>
<%End If%>
How should I form the "Then" statement now?
Please help me with the proper syntax..thnx
Do I need to like make a method that checks if "IsDefault" is true or not and then call it inside of inline code in my repeater ? How do I go about it ?
[EDIT]
I tried as follows:-
<% If (Eval("Container.DataItem,"IsDefault"")="True"?
("<asp:LinkButton ID="lnk1" Text="Set as Default" CommandName="SetDefault1" runat="server" CommandArgument='<%#Eval("User1ID") %>'
CausesValidation="false" Visible=true></asp:LinkButton>") : ("<asp:Label ID="label1" Text="Yes" runat="server" Visible=true></asp:Label>")
)%>
didnt work :( Help!!

If you want some control to be visible only on some condition, set the Visible property according to that condition:
<asp:Label ID="label1" Text="Yes" runat="server"
Visible="<%# DataBinder.Eval(Container.DataItem,"IsDefault") %>" />
EDIT
If you want the control INvisible for the "IsDefault" situation, reverse the test with something like Visible="<%# DataBinder.Eval(Container.DataItem,"IsDefault")==False %>".
I'm not quite sure about the exact syntax, but you should get the idea.

Here's your repeater markup. Notice both controls are hidden at the start:
<asp:Repeater runat="server" ID="rpt1" OnItemDataBound="rpt1_ItemDataBound" onitemcommand="rpt1_ItemCommand">
<ItemTemplate>
<p>
ID: <%# Eval("Id") %>
IsDefault: <%# Eval("IsDefault") %>
Name: <%# Eval("Name") %>
<asp:Label BackColor="Blue" ForeColor="White" runat="server" ID="lDefault" Text="DEFAULT" Visible="false" />
<asp:Button runat="server" ID="btnMakeDefault" Text="Make Default" Visible="false" CommandArgument='<%# Eval("Id") %>' />
</p>
</ItemTemplate>
</asp:Repeater>
And some code to go with it. Note I've simulated the retrieval of your collection of blluser objects, so there is some additional code there relating to this which you won't require as, presumably the bllusers collection that you bind to is coming from a db or something?
Anyway I think this is what you're looking for, but let me know if its not ;-)
//Dummy object for illustrative purposes only.
[Serializable]
public class bllUsers
{
public int Id { get; set; }
public bool isDefault { get; set; }
public string Name { get; set; }
public bllUsers(int _id, bool _isDefault, string _name)
{
this.Id = _id;
this.isDefault = _isDefault;
this.Name = _name;
}
}
protected List<bllUsers> lstUsers{
get
{
if (ViewState["lstUsers"] == null){
ViewState["lstUsers"] = buildUserList();
}
return (List<bllUsers>)ViewState["lstUsers"];
}
set{
ViewState["lstUsers"] = value;
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
buildGui();
}
}
private List<bllUsers> buildUserList(){
lstUsers = new List<bllUsers>();
lstUsers.Add(new bllUsers(1, false, "Joe Bloggs"));
lstUsers.Add(new bllUsers(2, true, "Charlie Brown"));
lstUsers.Add(new bllUsers(3, true, "Barack Obama"));
return lstUsers;
}
private void buildGui()
{
rpt1.DataSource = lstUsers;
rpt1.DataBind();
}
protected void rpt1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
bllUsers obj = (bllUsers)e.Item.DataItem;//this is the actual bllUser the row is being bound to.
//Set the labels
((Label)e.Item.FindControl("ldefault")).Visible = obj.isDefault;
((Button)e.Item.FindControl("btnMakeDefault")).Visible = ! obj.isDefault;
//Or use a more readable if/else if you want:
if (obj.isDefault)
{
//show/hide
}
else
{
//set visible/invisible
}
}
}
Hope this helps :-)

Sorry to say you to be honest i was unable to understand what actually you wanted to do
If your looking to use the condition in the Item Templet then i think
the following systax will help you
<asp:LinkButton ID="Label1" runat="server"
Text='<%# ((Eval("Cond"))="True" ? Eval("Result for True") : Eval("Result for False") )%>'></asp:LinkButton>