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SqlCommand.CommandTimeout Property


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

 virtual property int CommandTimeout { int get(); void set(int value); };
 property int CommandTimeout { int get(); void set(int value); };
public override int CommandTimeout { get; set; }
public int CommandTimeout { get; set; }
member this.CommandTimeout : int with get, set
member this.CommandTimeout : int with get, set
Public Overrides Property CommandTimeout As Integer
Public Property CommandTimeout As Integer

Property Value

The time in seconds to wait for the command to execute. The default is 30 seconds.




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


The CommandTimeout property will be ignored by older APM (Asynchronous Programming Model) asynchronous method calls such as BeginExecuteReader. It will be honored by newer TAP (Task Asynchronous Programming) methods such as ExecuteReaderAsync.

CommandTimeout has no effect when the command is executed against a context connection (a 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 Read requires two network packets, then it has 30 seconds to read both network packets. If you call 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 ");

Applies to

See also