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SqlError.Class Property

Gets the severity level of the error returned from SQL Server.

Namespace:  System.Data.SqlClient
Assembly:  System.Data (in System.Data.dll)

public byte Class { get; }

Property Value

Type: System.Byte
A value from 1 to 25 that indicates the severity level of the error. The default is 0.

Messages with a severity level of 10 or less are informational and indicate problems caused by mistakes in information that a user has entered. Severity levels from 11 through 16 are generated by the user, and can be corrected by the user. Severity levels from 17 through 25 indicate software or hardware errors. When a level 17, 18, or 19 error occurs, you can continue working, although you might not be able to execute a particular statement.

The SqlConnection remains open when the severity level is 19 or less. When the severity level is 20 or greater, the server usually closes the SqlConnection. However, the user can reopen the connection and continue. In both cases, a SqlException is generated by the method executing the command.

For more information on errors generated by SQL Server, see SQL Server Books Online.

The following example displays each SqlError within the SqlErrorCollection collection.

		public void DisplaySqlErrors(SqlException exception)
		{
			for (int i = 0; i < exception.Errors.Count; i++)
			{
				Console.WriteLine("Index #" + i + "\n" +
					"Source: " + exception.Errors[i].Source + "\n" +
					"Number: " + exception.Errors[i].Number.ToString() + "\n" +
					"State: " + exception.Errors[i].State.ToString() + "\n" +
					"Class: " + exception.Errors[i].Class.ToString() + "\n" +
					"Server: " + exception.Errors[i].Server + "\n" +
					"Message: " + exception.Errors[i].Message + "\n" +
					"Procedure: " + exception.Errors[i].Procedure + "\n" +
					"LineNumber: " + exception.Errors[i].LineNumber.ToString());
			}
			Console.ReadLine();
		}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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