sql server connection works for console project but not windows form project

Question

I am using console to write a class to handle a sql server link and another class to handle a data API. But If I use the same class in a windows form, neither of those classes works, they can not set up the connection. It fails when I try to connect sql server database and also, can not setup the connection with the Data API at all.

What is different between building a C# console project and C# windows form project? How do I set up those connections? Is there any configuration I can change?

ConnectionString = "Data Source=JF-T7K5-01;Initial Catalog=" + DataBaseName +";Integrated    Security=True;";
        Connection = new SqlConnection(ConnectionString);
        try
        {
            Connection.Open();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }

Answer 1

I would suggest that you first check framework type. I have tried both console and form, connection works on both.