Indicate format for TimeSpan parse
using System;
public class Example
{
public static void Main()
{
string value = "8";
TimeSpan interval;
if (TimeSpan.TryParseExact(value, "%h", null, out interval))
Console.WriteLine(interval.ToString("c"));
else
Console.WriteLine("Unable to convert '{0}' to a time interval", value);
}
}
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