Change Identity seeding value from code behind using C# and VB.Net in ASP.Net

How to change identity in asp.net C#/Vb.net behind code?

I will run scheudle task to change 1909000 to 1910000 on every month change

CREATE TABLE [dbo].[Courier] (
    [Id]                   INT           IDENTITY (1909000, 1) NOT NULL,
    [Invoice]              VARCHAR (MAX) NULL,
    [Courier]              VARCHAR (MAX) NULL,
    [AWBNumber]            VARCHAR (MAX) NULL,
    [DispatchEmail]        VARCHAR (MAX) NULL,
    [DispatchFullDateTime] VARCHAR (MAX) NULL,
    [DispatchDate]         DATE          NULL,
    [DispatchTime]         TIME          NULL,
    PRIMARY KEY CLUSTERED ([Id] ASC)
);