how to add onclick event to command field?

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Hi all

I need some help here

I have this delete button in gridview

VB

<asp:CommandField ButtonType="Image" DeleteImageUrl="~/Images/remove.png"
                DeleteText="" ShowDeleteButton="True" />

how to add OnClick event handler to this button

and How to get the id from the row which the button exist

thank you so much

Posted 5-May-12 6:25am

Sarah Mohammed77

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Sandeep Mewara 5-May-12 13:11pm

What exactly are you trying to do? You trying to implement delete functionality? Any confirmation prompt before deleting? What exactly?

Sarah Mohammed77 5-May-12 14:26pm

okay I have this button
<itemtemplate>
<asp:ImageButton ID="imgbtnDelete" runat="server" ImageUrl="~/Images/remove.png"
OnClick="AddToCart_Click" Text="delete"
CommandArgument='<%# Eval("ItemID") %>' Height="50px" Width="50px" postback="true" />

and the event handler for it like that

ImageButton myButton = sender as ImageButton;
if (myButton != null)
{
int ProductID = Convert.ToInt32(myButton.CommandArgument);
if (ProductID != 0)
{
for (int i = 0; i < Basket_DataTable.Rows.Count; i++)
if (Basket_DataTable.Rows[i][0].ToString() == ProductID.ToString())
Basket_DataTable.Rows.Remove(Basket_DataTable.Rows[i]);

}
}

when I click this button it gives me this error Invalid postback or callback argument

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Sandeep Mewara · Accepted Answer · 2012-05-05T08:46:00

See, you have entirely different issue and the way you asked/posted question was in different direction. You were trying to solve for something else.

Now, there could be few reasons why you are getting this issue. Easy/direct solution can be adding enableEventValidation="false" in your Page directive or Web.config file.

But, it is always good to hit the root cause. It might be that you are rebinding your grid on every postback. Thus, before RowCommand fire your GridView will rebind and all control within it will be assigned to new id. So RowCommand could not get the item which have fired the event. To avoid this, all you need to do is put your grid bind line in IsPostBack condition.

C#

if (!IsPostBack)
{
      //Your code for Bind data
}

Detailed explanation here: Invalid postback or callback argument solution. Event validation...[^]

Interesting to read one blog entry related to same: “Invalid postback or callback argument” in ASP.NET[^] - It exposes few other reasons on why one can get the same error. Nice read.