Error - Unable to cast object of type 'System.Web.UI.WebControls

Question

Hi

I am getting error - Unable to cast object of type 'System.Web.UI.WebControls.HiddenField' to type 'System.IConvertible'.

HiddenField hdfDate = ((HiddenField)e.Item.FindControl("hdfDate"));

<asp:HiddenField ID="hdfDate" runat="server" Value='<%# Eval("SessionDate") %>' />

Thanks

Vishal Joshi · Answer

Hello Ramco Please try DateTime.Compare() to get the expected result. int res = DateTime.Compare(hdfDate, objGrpResult.GrpSessionStartDate); Returns response is equal to 0 since d1 is equal to d2 Returns response is equal to -1 since d1 is earlier than d2 Returns response is equal to 1 since d1 is later than d2

Ramco Ramco · Answer

Hi Mohammed I am getting error on below line. Valie in hdfDate is "03/06/2023 00:00:00" Value in GrpSessionStartDate is 20/05/2023 00:00:00 if (Convert.ToDateTime(hdfDate) When i try below line then also gets error - DateTime sDate = DateTime.ParseExact(hdfDate.Value, "yyyy/MM/dd HH:mm:ss", CultureInfo.InvariantCulture); Thanks

Mohamed Azarudeen Z · Answer

Hi ramco You can modify your code as follows: HiddenField hdfDate = e.Item.FindControl("hdfDate") as HiddenField; By using the as keyword, you attempt to perform the cast, and if the cast fails, the variable hdfDate will be assigned a null value instead of throwing an exception. Make sure to update your code accordingly and try running it again. This should resolve the casting issue you're experiencing.

Error - Unable to cast object of type 'System.Web.UI.WebControls

Answers (3)