System.Data.SqlClient.SqlCommand.CommandTimeout Property

Gets or sets the wait time before terminating the attempt to execute a command and generating an error.


public override int CommandTimeout { set; get; }


Current value in seconds.


A value of 0 indicates no limit (an attempt to execute a command will wait indefinitely).


The SqlCommand.CommandTimeout property will be ignored during asynchronous method calls such as SqlCommand.BeginExecuteReader.

SqlCommand.CommandTimeout has no effect when the command is executed against a context connection (a System.Data.SqlClient.SqlConnection opened with "context connection=true" in the connection string).


This property is the cumulative time-out (for all network packets that are read during the invocation of a method) for all network reads during command execution or processing of the results. A time-out can still occur after the first row is returned, and does not include user processing time, only network read time.

For example, with a 30 second time out, if SqlDataReader.Read requires two network packets, then it has 30 seconds to read both network packets. If you call SqlDataReader.Read again, it will have another 30 seconds to read any data that it requires.


using System;
using System.Data.SqlClient;
public class A {
   public static void Main() {
      string connectionString = "";
      // Wait for 5 second delay in the command
      string queryString = "waitfor delay '00:00:05'";
      using (SqlConnection connection = new SqlConnection(connectionString)) {
         SqlCommand command = new SqlCommand(queryString, connection);
         // Setting command timeout to 1 second
         command.CommandTimeout = 1;
         try {
         catch (SqlException e) {
            Console.WriteLine("Got expected SqlException due to command timeout ");


Namespace: System.Data.SqlClient
Assembly: System.Data (in System.Data.dll)
Assembly Versions: 1.0.5000.0,