[FormatException: Input string was not in a correct format.]
System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +12838615
System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +122
System.Int32.Parse(String s) +26
Course.GetCId() in c:\Domains\125841\lda.academy\wwwroot\Course.aspx.cs:315
Course.Page_Load(Object sender, EventArgs e) in c:\Domains\125841\lda.academy\wwwroot\Course.aspx.cs:55
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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