"ConnectionStrings": { "DefaultConnection": "Server=DESKTOP-V4RQQ32\\SQLEXPRESS;Database=SchoolManagementDB;Trusted_Connection=True;" },
using System.Data.SqlClient; SqlConnection conn = new SqlConnection(); conn.ConnectionString = "Data Source=ServerName;" + "Initial Catalog=DataBaseName;" + "User id=UserName;" + "Password=Secret;"; conn.Open();