Select MAX(nomerDoc)

database.Open();
            OleDbCommand SQLCommand = new OleDbCommand();
            SQLCommand.CommandText = _SQLQueryString;

            SQLCommand.Connection = database;
            int response = -1;
            response = SQLCommand.ExecuteNonQuery();
            database.Close();

_SQLQueryString = SELECT MAX(nomerDoc) FROM table

response = SQLCommand.ExecuteScalar();

response = SQLCommand.ExecuteScalar();

try
{
response = (int)SQLCommand.ExecuteScalar();
}
catch
{}

CREATE TABLE [dbo].[tblCounter](
	[Id] [int] NOT NULL,
	[Counter] [int] NOT NULL,
 CONSTRAINT [PK_tblCounter] PRIMARY KEY CLUSTERED 
(
	[Id] ASC
)) ON [PRIMARY]

insert into tblCounter (Id,Counter)
values(1,0)

update tblCounter set Counter=Counter+1

select Counter from tblCounter
where Id=1