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Database deletion not working when parameter involved

Posted By:      Posted Date: September 02, 2010    Points: 0   Category :ASP.Net
Hi,I have a system in which users can enter records into a database via ajax.  Each user may hold many values in the database, with different pageId and itemId values.  Each user is identified by a GUID set to a cookie.  The system needs to prevent the user from entering two pieces of data with the same pageId and itemId, so I've created a script to do two database updates:Firstly, all records are deleted from the database where the memberGUID, pageId and itemId fields match (i.e. they've already added this item).Secondly, the record is then recreated.It all works brilliantly, except when the GUID value is passed into the delete statement, then I just get a caught exception.So this works: public class UpdateValue { public static string Hello(int pageId, int itemId, string inOut, string period, decimal value) { //Initialise variables and objects string cookie = HttpContext.Current.Request.Cookies["visitorGUID"].Value; inOut = inOut.Substring(0, 1); //Delete value if already present SqlConnection connDel; connDel = new SqlConnection(GlobalSettings.DbDSN); SqlCommand commDel; commDel = new SqlCommand("DELETE FROM budgetData WHERE pageId = @pageId AND itemId = @itemId;", connDel); commDel.Parameters.Add("@pageId", System.Data.SqlDbType.Int); commDel.Parameters["@pageId"].Value = pag

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