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出错：

Server Error in '/' Application.

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Index and length must refer to a location within the string.
Parameter name: length

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.ArgumentOutOfRangeException: Index and length must refer to a location within the string.
Parameter name: length

Source Error:

Line 24: 
Line 25: 			int CateID = Convert.ToInt32(_cid);
Line 26: 			int BigCateID = Convert.ToInt32(CateID.ToString().Substring(0,2));
Line 27: 			_bigcateid = BigCateID.ToString();
Line 28: