How to call Button OnCLick eventhandler in code behind with a value?

Question

I am trying to create Anchors in code behind and delete buttons as well for each Anchor. I dont know if i can call an event handler for each one of the link with an ID so i can delete the row specified from the database. This is what i have done. I created an anchor and an ASp button but not sure how i can call it with that ImageID. Is it possible? If so How? Thanks a lot in advance!! This is in C#, asp.net.

 HtmlAnchor apdf = new HtmlAnchor();
 apdf.ID = Guid.NewGuid().ToString("N");
 string ImageID = "";
 if (dsreport != null && dsreport.Tables[0].Rows.Count > 0)
 {
      apdf.InnerText = dsreport.Tables[0].Rows[0]["ImageName"].ToString();
      apdf.Attributes.Add("style", "font-weight: bold; font-size: 13px; margin: 0px;    font-family: Arial; color: #1e7c9b; text-decoration: underline");
      apdf.Target = "_blank";
      ImageSalesID = dsreport.Tables[0].Rows[0]["ImageID"].ToString();
      apdf.HRef = "PDFdownload.aspx?ID=" + ImageID;

 }   
 Button btnDelete = new Button();
 btnDelete.ID = Guid.NewGuid().ToString("N");
 btnDelete.OnClick += Eventhandler;
 btnDelete.Text = "Delete";

not sure exactly what you asking but you can know what button is cliked by reading the id of the clicked button — COLD TOLD
– COLD TOLD, Commented Apr 18, 2012 at 21:48
Don't create these in code behind. Use a Repeater and create a Command button and use the Repeater.ItemCommand and set the CommandArgument instead. It's cleaner, uses less code, is more standard, and easier. msdn.microsoft.com/en-us/library/… (Or use a DataList if you prefer). — David
– David, Commented Apr 18, 2012 at 21:51

COLD TOLD · Accepted Answer · 2012-04-18 21:54:01Z

2

I hope this may help you in some way

 Button btnDelete = new Button();
    btnDelete.Click += new EventHandler(button_Click);

    protected void button_Click (object sender, EventArgs e)
    {
        Button button = sender as Button;
        string buttonid = button.ID.ToString()
        // identify which button was what row to update based on id clicked and perform necessary actions
    }

answered Apr 18, 2012 at 21:54

COLD TOLD

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2 Comments

challengeAccepted Over a year ago

Thank you! It helps me go half way. Is it possible to send something in new EventHandler(button_Click) like an ImageID or something??

COLD TOLD Over a year ago

take a look at this stackoverflow.com/questions/4815629/…

Richard · Accepted Answer · 2012-04-18 22:25:16Z

From what I can gather, you're pressing a button, and then wanting to delete something that's related to said button; if this is the case I would recommend using the CommandArgument property on a button. You can also specify the CommandName as well which can assist in determine what type of action to occur. Here's a quick example:

<asp:Button ID="btnDelete" runat="server" CommandName="DeleteRow" CommandArgument="1" Text="Delete Row 1" OnClick="DeleteRow" />
<asp:Button ID="btnDelete" runat="server" CommandName="DeleteRow" CommandArgument="2" Text="Delete Row 2" OnClick="DeleteRow" />
<asp:Button ID="btnDelete" runat="server" CommandName="DeleteRow" CommandArgument="3" Text="Delete Row 3" OnClick="DeleteRow" />

All 3 buttons will trigger the same event. Then within the actual event itself you can check what the command arguments were on the sender, by casting it as a Button, like so.

protected void DeleteRow(object sender, EventArgs e)
{
    var buttonClicked = sender as Button;
    var rowId = buttonClicked.CommandArgument;
    var action = buttonClicked.CommandName;

    // do something depending on the action and the argument
}

Hope this helps. :)

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