C#

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Hello friend! I am developing a Windows application (WinForms) to manage universities with c#, it is an application that is very complex because it is a Multi-user application, I want that for this application I can use a single database centralized by all users of this application, which will be managed by myself and my development team. Is this possible? What would be the best and least expensive solution, taking into account my capacity? Also in terms of cost, between a SQL SERVER EXPRESS database and a MySQL database, which one might be better for me? And which one is well suited to C#, using Crystal Report and Visual Studio as well? Your answers will help me a lot to make a decision and also develop an efficient solution. 

I'm thinking about whether it's possible to host only my SQL SERVER EXPRESS, or MySQL database to which my Windows software or application designed in C# can connect remotely so that the various users of my device can access the remote database

Thank you for your help

public abstract class Indicator : ExtendedIndicator
{
    [global::Newtonsoft.Json.JsonIgnoreAttribute]
    protected ITradingManager? TradingManager { get; }
}

class MyTradingManager
{
      public ITradingManager _tradeManager;


      public MyTradeManager(ITradingManager argTradingManager)
      {
       _tradeManager = argTradingManager;
      }

}

internal class SampleIndicator : Indicator
{
      MyTradeManager _tradingManager;

      public SampleIndicator ()
      {
           _tradingManager = new(TradingManager ); <- Here the problem occurs !!!
      }
}