[Solved] String was not recognized as a valid DateTime from DateTimePicker

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Assuming hdndate.Value is actually a string and its value is "28/04/2014":

Replace this:

Convert.ToDateTime(hdndate.Value)

With this:

DateTime.ParseExact(hdndate.Value, "dd/MM/yyyy", CultureInfo.InvariantCulture);

DateTime.ParseExact allows you to specify the exact format of your input string, so that it can correctly generate a DateTime from it. In this case, your format is dd/MM/yyyy.

solved String was not recognized as a valid DateTime from DateTimePicker