SqlException.State Property  
Definition
Important
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Gets a numeric error code from SQL Server that represents an error, warning or "no data found" message. For more information about how to decode these values, see Database Engine Events and Errors.
public:
 property System::Byte State { System::Byte get(); };public byte State { get; }member this.State : bytePublic ReadOnly Property State As ByteProperty Value
The number representing the error code.
Examples
The following example displays each SqlError within the SqlErrorCollection collection.
using System;
using System.Data;
using System.Data.SqlClient;
using System.Text;
class Program
{
    static void Main()
    {
        string s = GetConnectionString();
        ShowSqlException(s);
        Console.ReadLine();
    }
    public static void ShowSqlException(string connectionString)
    {
        string queryString = "EXECUTE NonExistantStoredProcedure";
        StringBuilder errorMessages = new StringBuilder();
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            SqlCommand command = new SqlCommand(queryString, connection);
            try
            {
                command.Connection.Open();
                command.ExecuteNonQuery();
            }
            catch (SqlException ex)
            {
                for (int i = 0; i < ex.Errors.Count; i++)
                {
                    errorMessages.Append("Index #" + i + "\n" +
                        "Message: " + ex.Errors[i].Message + "\n" +
                        "Error Number: " + ex.Errors[i].Number + "\n" +
                        "LineNumber: " + ex.Errors[i].LineNumber + "\n" +
                        "Source: " + ex.Errors[i].Source + "\n" +
                        "Procedure: " + ex.Errors[i].Procedure + "\n");
                }
                Console.WriteLine(errorMessages.ToString());
            }
        }
    }
    static private string GetConnectionString()
    {
        // To avoid storing the connection string in your code,
        // you can retrieve it from a configuration file.
        return "Data Source=(local);Initial Catalog=AdventureWorks;"
            + "Integrated Security=SSPI";
    }
}
Public Sub ShowSqlException(ByVal connectionString As String)
    Dim queryString As String = "EXECUTE NonExistantStoredProcedure"
    Dim errorMessages As New StringBuilder()
    Using connection As New SqlConnection(connectionString)
        Dim command As New SqlCommand(queryString, connection)
        Try
            command.Connection.Open()
            command.ExecuteNonQuery()
        Catch ex As SqlException
            Dim i As Integer
            For i = 0 To ex.Errors.Count - 1
                errorMessages.Append("Index #" & i.ToString() & ControlChars.NewLine _
                    & "Message: " & ex.Errors(i).Message & ControlChars.NewLine _
                    & "Error Number: " & ex.Errors(i).Number & ControlChars.NewLine _
                    & "LineNumber: " & ex.Errors(i).LineNumber & ControlChars.NewLine _
                    & "Source: " & ex.Errors(i).Source & ControlChars.NewLine _
                    & "Procedure: " & ex.Errors(i).Procedure & ControlChars.NewLine)
            Next i
            Console.WriteLine(errorMessages.ToString())
        End Try
    End Using
End Sub
Remarks
This is a wrapper for the State property of the first SqlError in the Errors property.