In the core asp.net 3.1, the program defines a static variable, tried to call other methods or controller, how to do?

 
Public static DataTable InitData; 
Public static void Main (string [] args) 
{
Var host=CreateHostBuilder (args). The Build (); 

InitData=(https://bbs.csdn.net/topics/DAL.GetData1); 

The host. The Run (); 

//CreateHostBuilder (args). The Build (). The Run (); 
} 

Access to less than in the other classes, could you tell me how to solve this?