Operation is not valid due to the current state of the object in asp.net

[Voulture72]

\[code\][InvalidOperationException: Operation is not valid due to the current state of the object.] System.Web.HttpValueCollection.ThrowIfMaxHttpCollectionKeysExceeded() +2420862 System.Web.HttpValueCollection.FillFromEncodedBytes(Byte[] bytes, Encoding encoding) +58 System.Web.HttpRequest.FillInFormCollection() +159[HttpException (0x80004005): The URL-encoded form data is not valid.] System.Web.HttpRequest.FillInFormCollection() +217 System.Web.HttpRequest.get_Form() +104 System.Web.HttpRequest.get_HasForm() +9038959 System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +97 System.Web.UI.Page.DeterminePostBackMode() +69 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +135\[/code\]Getting this error again and again My code behind!! The cancel button is inside a DATAGRID\[code\]if (((System.Web.UI.WebControls.Button)e.CommandSource).CommandName == "Cancel") { string value = http://stackoverflow.com/questions/12763932/(e.Item.FindControl("txtStatDesc") as System.Web.UI.WebControls.Label).Text; if (value.Equals("Sent", StringComparison.CurrentCultureIgnoreCase)) { Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "alert('You can not cancel the dta because it is in sent mode. Cancellation refused');", true); } else if (value.Equals("Prepared", StringComparison.CurrentCultureIgnoreCase)) Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "alert('DEF');", true); else Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "alert('xyz');", true); }\[/code\]