[ArgumentNullException: String reference not set to an instance of a String.
Parameter name: s]
System.Text.Encoding.GetBytes(String s) +7725105
DrHussienV2.BusinessLogicLayer.CommonFunctions.ToUtf(String text) in E:\Ahmed Salah\DrHussienCode\DrHussienV2.BusinessLogicLayer\CommonFunctions.cs:82
DrHussienV2.BusinessLogicLayer.DepartmentFile.get_FullFilePath() in E:\Ahmed Salah\DrHussienCode\DrHussienV2.BusinessLogicLayer\DepartmentFiles.cs:137
DrHussienV2.Download.ProcessRequest(HttpContext context) in E:\Ahmed Salah\DrHussienCode\DrHussienV2\d.ashx.cs:42
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
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