As far as I know no, there is no way to change this default. The constructor code for a SqlCommand is this:

    public SqlCommand()
    {
        this.ObjectID = Interlocked.Increment(ref _objectTypeCount);
        this._commandTimeout = 30;
        this._updatedRowSource = UpdateRowSource.Both;
        this._prepareHandle = -1;
        this._rowsAffected = -1;
        this._notificationAutoEnlist = true;
        GC.SuppressFinalize(this);
    }

A possible workaround is to use a predefined SqlCommand passed as argument to the constructor that takes a SqlCommand as argument.

So you could create a global SqlCommand (a template)

     Dim commandTemplate60 = new SqlCommand()
     commandTemplate60.Timeout = 60

and then when you need a command with a timeout of 60 seconds

    Dim cmd As New System.Data.SqlClient.SqlCommand(commandTemplate60)


However, setting directly the Timeout, doesn't seems to be a lot of work 




The default [CommandTimeout][cmd] value is 30 seconds.  You can manually change the value on an instance of the command object by doing the following



    Dim cmd As New System.Data.SqlClient.SqlCommand
    cmd.CommandTimeout = 60

Is there a way to specify a different default value, such that all new command objects will automatically have this value within your solution when they are created?





 [cmd]: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.commandtimeout.aspx