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I am having an error Specified cast is not valid

//this is the code in the booking form
// time is public static
time = TimeSpan.Parse(dtpTime.Value.ToShortTimeString());
//this is the code in another form
while (rdr.Read())
    for (int i = 0; i < rdr.FieldCount; i++)
        if ((TimeSpan)rdr[6] > Booking.time)
            // etc etc
Updated 19-Mar-10 0:53am

I'm assuming rdr.Read() returns a string? If so, you will need to use Timespan.Parse or Timespan.TryParse to parse the string, you cannot just cast as there is no implicit or explicit conversion from string defined.
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So what is the data type of the item?
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What is rdr?
What is rdr[6]?
Have you looked using the debugger? Put a breakpoint on the "if ((TimeSpan)rdr[6] > Booking.time)" line and see what the rdr array contains.
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