Server Error in '/' Application.

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

Source Error:


Line 56:             } else
Line 57:             {
Line 58:                 var referans = islem.ReferanslarIslem.ReferansById(id)[0];
Line 59:                 li_referans_adi.Text = referans.Firma_adi + "<img src=\"" + referans.Path + "\">";
Line 60:                 li_referans_yili.Text = String.IsNullOrEmpty(referans.Date) ? "2021" : referans.Date;

Source File: c:\Inetpub\vhosts\mavotek.com\httpdocs\referanslar.aspx.cs    Line: 58

Stack Trace:


[ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index]
   System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource) +69
   System.Collections.Generic.List`1.get_Item(Int32 index) +12932753
   icerik_sayfalari.Page_Load(Object sender, EventArgs e) in c:\Inetpub\vhosts\mavotek.com\httpdocs\referanslar.aspx.cs:58
   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


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4682.0