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read data from usb port

Posted By:      Posted Date: October 23, 2010    Points: 0   Category :WPF
 
I need a C# code for reading data from usb port


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Invalid attempt to read when no data is present.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.InvalidOperationException: Invalid attempt to read when no data is present.

Source Error: 

Line 53:             if (reader.HasRows)
Line 54:             {
Line 55:                 Response.Write(reader.GetString(0));

Here is my code:

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