public static async Task <SQL_Request> OpenConnection(string connectionString = null)
{
if (connectionString == null)
{
SQL_Request request = new SQL_Request();
return(await Task.FromResult <SQL_Request>(request.OpenConnection(SQLfunc._ConnectionString)));
}
else
{
SQL_Request request = new SQL_Request();
return(await Task.FromResult <SQL_Request>(request.OpenConnection(connectionString)));
}
}