Server Error in '/' Application.

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Line 45:         //title
Line 46:         ServiceDAL serDAL = new ServiceDAL();
Line 47:         service ser = serDAL.FindByCondition(c => c.id.Equals(id)).FirstOrDefault();
Line 48:         ser.views += 1;
Line 49:         serDAL.SubmitChange();

[FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +7687831
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +119
   System.String.System.IConvertible.ToInt32(IFormatProvider provider) +46
   System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) +373
   System.Data.Linq.DBConvert.ChangeType(Object value, Type type) +3439
   System.Data.Linq.SqlClient.Visitor.CoerceBinaryArgs(SqlExpression& arg1, SqlExpression& arg2) +255
   System.Data.Linq.SqlClient.Visitor.VisitBinaryOperator(SqlBinary bo) +510
   System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node) +196
   System.Data.Linq.SqlClient.SqlVisitor.VisitExpression(SqlExpression exp) +8
   System.Data.Linq.SqlClient.SqlVisitor.VisitSelectCore(SqlSelect select) +46
   System.Data.Linq.SqlClient.SqlVisitor.VisitSelect(SqlSelect select) +20
   System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node) +1024
   System.Data.Linq.SqlClient.SqlProvider.BuildQuery(ResultShape resultShape, Type resultType, SqlNode node, ReadOnlyCollection`1 parentParameters, SqlNodeAnnotations annotations) +718
   System.Data.Linq.SqlClient.SqlProvider.BuildQuery(Expression query, SqlNodeAnnotations annotations) +161
   System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +137
   System.Data.Linq.DataQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() +31
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +7893590
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +57
   ServiceDAL.FindByCondition(Expression`1 WhereClause) +46
   servicesdetail.seo() in d:\vhosts\khangthanh.com\httpdocs\servicesdetail.aspx.cs:47
   servicesdetail.Page_Load(Object sender, EventArgs e) in d:\vhosts\khangthanh.com\httpdocs\servicesdetail.aspx.cs:18
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +43
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2602