[ArgumentNullException: 値を Null にすることはできません。
パラメーター名:String]
System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +14542446
System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +174
eBootStrap4.forum.Page_Load(Object sender, EventArgs e) in C:\yk\開発\expbootstrap\eBootStrap2024_R10\eBootStrap4\forum.aspx.cs:1217
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +154
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4082
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