Question

I want to delete a some data in a page and want to warn to user (show a messagebox with YES/NO) and if user click on YES delete data

is it possible to implememt MessageBox in ASP?if yes how?

Answer 1

with confirm it’s as simple as:

<input type="submit" value="delete" onclick="javascript:confirm('Are you sure?')"/>

As for ASP.NET, you can do this on server-side:

btnDelete.Attributes.Add("onclick", "return confirm('Are you sure?')");

Or, on markup:

<asp:Button ID="btnDelete" runat="server" Text="Delete" OnClientClick="return confirm('Are you sure?');" />

Edit:
Using a GridView, you can do something like this on the server-side code:

public partial class _Default : System.Web.UI.Page {

    Dictionary<string, string> collection = null;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            collection = new Dictionary<string, string>();
            collection.Add("Microwave", "$299");
            collection.Add("Coffee maker", "$59");
            collection.Add("Arm chair", "$89");
        }
        GridView1.DataSource = collection;
        GridView1.DataBind();
    }

    protected void GridView1_RowDataBound(Object sender, GridViewRowEventArgs e)
    {
        if (DataControlRowType.DataRow == e.Row.RowType)
        {
            ((LinkButton)e.Row.FindControl("lnkDelete"))
                .Attributes.Add("onclick", "return confirm('are you sure?')");

        }
    }

    protected void GridView1_RowCommand(Object sender, GridViewCommandEventArgs e) {
        if (e.CommandName.ToLower() == "delete")
        {
            // this code should be executed only when the user clicks "ok"
            // in the confirm message that appears on the browser

            // your implementation goes here
        }
    }
}

And your markup could be done similarly to the following. As for the template column, it’s easy to create a command column through visual studio and then convert it into a template column, so you can actually have an ID for the delete link button (or a button) and find it through e.Row.FindControl as shown above.

<asp:GridView ID="GridView1" runat="server" OnRowCommand="GridView1_RowCommand"
    OnRowDataBound="GridView1_RowDataBound" AutoGenerateColumns="False">
    <Columns>
        <asp:BoundField DataField="Key" HeaderText="Product" />
        <asp:BoundField DataField="Value" HeaderText="$$$" />
        <asp:TemplateField ShowHeader="False">
            <ItemTemplate>
                <asp:LinkButton ID="lnkDelete" runat="server" CausesValidation="False" 
                    CommandName="Delete" Text="Remove"></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>