Server Error in '/' Application.

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Line 52: 
Line 53:                 //var exh = (from ex in db.Exhibitors where ex.Company.Replace(" ", "-").Replace("&-", "").Replace("&", "-").Replace(".", "").Replace("'", "") == id select ex).FirstOrDefault();
Line 54:                 var exh = (from ex in db.Exhibitors where ex.RowId == Convert.ToInt32(id) select ex).FirstOrDefault();
Line 55:                 if (exh != null)
Line 56:                 {

[FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +267
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +175
   lambda_method(Closure ) +102

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0
   System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +122
   System.Delegate.DynamicInvokeImpl(Object[] args) +159
   System.Data.Linq.CommonDataServices.GetKeyFromPredicate(MetaType type, Dictionary`2 keys, Expression mex, Expression vex) +586
   System.Data.Linq.CommonDataServices.GetKeysFromPredicate(MetaType type, Dictionary`2 keys, Expression expr) +342
   System.Data.Linq.CommonDataServices.GetKeyValues(MetaType type, LambdaExpression predicate) +117
   System.Data.Linq.CommonDataServices.GetCachedObject(Expression query) +758
   System.Data.Linq.SqlClient.SqlProvider.GetCachedResult(Expression query) +75
   System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +104
   System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute(Expression expression) +50
   ASP.remoreferrals_aspx.Page_Load(Object sender, EventArgs e) in d:\ASPX_Sites\HomeShowCenter\RemoReferrals.aspx:54
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +154
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4082