Asp.net error in Firefox only when clicking button repeatedly

[pechar]

Hi all,

I created a test web application in asp.net. It works like a dream in IE but when it gets to Firefox I get an exception as follows

-----------------------------------------------------------------------------------------
"System.Argumen tException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventVali dation="true"/> in configuration or <%@ Page EnableEventVali dation="true" %> in a page."

Stack Trace:

[ArgumentExcepti on: Invalid postback or callback argument. Event validation is enabled using <pages enableEventVali dation="true"/> in configuration or <%@ Page EnableEventVali dation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptMan ager.RegisterFo rEventValidatio n method in order to register the postback or callback data for validation.]
System.Web.UI.C lientScriptMana ger.ValidateEve nt(String uniqueId, String argument) +2127849
System.Web.UI.C ontrol.Validate Event(String uniqueID, String eventArgument) +106
System.Web.UI.W ebControls.Butt on.RaisePostBac kEvent(String eventArgument) +32
System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEven tHandler.RaiseP ostBackEvent(St ring eventArgument) +7
System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler sourceControl, String eventArgument) +11
System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection postData) +33
System.Web.UI.P age.ProcessRequ estMain(Boolean includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint) +5102
-----------------------------------------------------------------------------------------------------

I get this when I click a button repeatedly, say when a request is not yet completed. In simple english I click any button on the form before the form fully loads. My code is as follows:

        protected void Page_Load(object sender, EventArgs e)
        {
            if(!this.IsPostBack)
                ArrayToDataTable();   
        }
 
        protected override void OnPreRender(EventArgs e)
        {
            GridView1.DataBind();
            base.OnPreRender(e);
        }
 
        private void ArrayToDataTable()
        {
            DataTable dt = new DataTable();
            DataRow dr;          
 
            /*this converts returned array into an arraylist*/
            ArrayList a = ArrayList.Adapter(ProductServices.GetAllProducts("CASH"));
            ProductServices.Product prod = new ProductServices.Product();
 
            /*creates column names with same name as in Product object*/
            foreach (PropertyInfo prop in prod.GetType().GetProperties())
            {
                dt.Columns.Add("col_" + prop.Name, prop.PropertyType);
                //Response.Write(prop.PropertyType);
            }
 
            dt.Columns.Add("col_ResellerPrice", typeof(System.Decimal));
 
 
            foreach (ProductServices.Product p in a)
            {
                dr = dt.NewRow();
                dr["col_StockCode"] = p.StockCode;
                dr["col_Name"] = p.Name;
                dr["col_Unit"] = p.Unit;
                dr["col_Brand"] = p.Brand;
                dr["col_Quantity"] = p.Quantity;
                dr["col_StockGroup"] = p.StockGroup;
                dr["col_LongDescription"] = p.LongDescription;
                dr["col_RetailPrice"] = p.RetailPrice;                                
                dr["col_Discount"] = p.Discount;
                dr["col_ResellerPrice"] = p.RetailPrice -(p.RetailPrice * (p.Discount / 100));
                //product.CategoryCode = 
                //product.DeliveryCost = 
                dt.Rows.Add(dr);
            }
            Cache["data"] = dt;               
            GridView1.DataSource = dt;            
        }
 
        protected void Button1_Click(object sender, EventArgs e)
        {
            DataTable cachedDT = (DataTable) Cache["data"];
            cachedDT.DefaultView.RowFilter = "col_Quantity > 30";
            cachedDT.DefaultView.Sort = "col_Quantity ASC";
            GridView1.DataSource = cachedDT;            
        }
 
        protected void Button2_Click(object sender, EventArgs e)
        {
            DataTable cachedDT = (DataTable)Cache["data"];
            cachedDT.DefaultView.RowFilter = "";
            cachedDT.DefaultView.Sort = "";
            GridView1.DataSource = cachedDT;            
        }
 

I am using .net 2.0 on windows XP. This only happens in Firefox (currently using latest verion 2.0.0.11)

Thanks in advance

[radcaesar]

Move your data binding inside the

if !(IsPostback) {} block.

[pechar]

Move your data binding inside the

if !(IsPostback) {} block.

I thought about this before but it won't work since I need it to DataBind() whether or not it is a PostBack. I'm using Caching to reduce postback to server. Any other idea?

Thanks

[pechar]

Anyone please? I really need to get this running and can't find a solution...

[Plater]

Well you could always turn off event validation like it says. Unless you really need it?

[pechar]

Well you could always turn off event validation like it says. Unless you really need it?

Well I'd rather not turn it off. It's there to be used not disabled :/
Is this a firefox problem due to its rendering method??

Thanks

[Plater]

Well it starts out disabled, you had to turn it on.
As to what firefox is doing, I don't know. Have to find out what is different between a successful request and a failed request.

If I had to guess, everytime you do a postback, there is like a "state" (probably some long unique string, "asp-state"?) that would get updated. I am thinking that firefox is retaining the old state until the new webpage is completely loaded, so clicking the button a lot in a row sends off multiple requests from the same "state", meanwhile the server keeps changing it's "state" and sees the extra requests as wrong since they have the wrong state.

Dunno a way around it.

[pechar]

Well it starts out disabled, you had to turn it on.
As to what firefox is doing, I don't know. Have to find out what is different between a successful request and a failed request.

If I had to guess, everytime you do a postback, there is like a "state" (probably some long unique string, "asp-state"?) that would get updated. I am thinking that firefox is retaining the old state until the new webpage is completely loaded, so clicking the button a lot in a row sends off multiple requests from the same "state", meanwhile the server keeps changing it's "state" and sees the extra requests as wrong since they have the wrong state.

Dunno a way around it.

Yes I think you're right and it's just what I was thinking too. Its all in the way firefox renders the page. I also notice that firefox lets teh user click buttons while a postback is happeneing. IE does not

Anyway thanks I'll have to think of another way.
Regards

[satxEwallace]

I know this thread is a bit old, but if anyone has this error, try adding the following line to the Page_Load method:

Response.Cache. SetNoStore();

[pechar]

Thanks will try this if I remember where I had the problem :)