DataValueField pass value to repeater? - asp.net

Question

So if the user selects a value from a dropDownList and clicks the button, the ID is passed to the code behind(which is where I want it)
E.g.
<asp:DropDownList ID="DropDownList" runat="server" AppendDataBoundItems="true" DataTextField="Company_Name" DataValueField="id">
<asp:ListItem Text="---Select---" Value="0" />
</asp:DropDownList>
So dataValueField will pass the 'id' of the selected record in the DD.
However On the same page I am using a repeater to display records that have been previously chosen from the drop down, Beside each record i have a 'Change Prices' button which I want to perform a task when clicked, all works fine however all I need is the same 'id'.
So is this done in a similar way? E.g
<asp:Repeater ID="repeaterShowName" runat="server">
<HeaderTemplate>
<tr>
<th>
<asp:Label ID="SubConName" Text="Current SubContractors" runat="server"></asp:Label>
</th>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td>
<asp:Label ID="SubCon" Text='<%# Bind ("Company_Name") %>' runat="server"></asp:Label>
</td>
<td>
<asp:LinkButton ID="AddNewBOQLink" runat="server" OnClick="EditPricesForSubContractor" CssClass="bottomhyperlink">Change Prices</asp:LinkButton>
</td>
</tr>
</ItemTemplate>
</asp:Repeater>
//So Do I add in DataValueField="id" inside the link button, so when the user selects the hyperlink beside the name, it will automatically have the 'id?

Answer 1

You should use the CommandArgument property of the LinkButton to pass the id to the method that handles the click.
So your LinkButton will now look like this:
<asp:LinkButton ID="AddNewBOQLink" runat="server" CommandArgument='<%# Bind("id")%>' CssClass="bottomhyperlink">Change Prices</asp:LinkButton>
And you want to add the following property to your Repeater:
<asp:Repeater .... OnItemCommand="repeater_Command" ...
The method that will handle the command event will look like this
void repeater_Command(Object Sender, RepeaterCommandEventArgs e) {
//retrieve the id like so
int id = (int)e.CommandArgument;
}
Also, note that I removed the OnClick property from the LinkButton. It is not needed as you are handling the click via the repeater's OnItemCommand method.
In addition, you may want to consider adding a CommandName propery to the LinkButton. This is used to identify which command you wish to execute. Currently, you only have a single command: Change Prices. But in the future you may want to add an additional button with a different command.
In order to do this, add the following property to the LinkButton:
<asp:LinkButton ... CommandName="ChangePrice" ...
And modify the repeater_Command method to handle the CommandName. Like so:
void repeater_Command(Object Sender, RepeaterCommandEventArgs e) {
switch(e.CommandName)
{
case "ChangePrice":
//retrieve the id like so
int id = (int)e.CommandArgument;
break;
}
}