This script connects to a SQL Server instance and enumerates all the databases available in it.

Using This script you can list all SQL server databases

using System.Data;
using System.Data.SqlClient;
....


 public static void GetDatabaseList()
        {
           String conStr=  "Data Source=MYSERVER; User ID=Username;Password=password;";
            using (SqlConnection sqlConx = new SqlConnection(conStr))
            {
                sqlConx.Open();
                DataTable tblDatabases = sqlConx.GetSchema("Databases");
                sqlConx.Close();

                foreach (DataRow row in tblDatabases.Rows)
                {
                    Console.WriteLine(String.Format("Database Name : {0}" , row["database_name"]));
                }
            }
        }