Connectivity of only column from database

public class DBManagement
{
    public SqlConnection OpenConnection()
    {
        string connectionString = "Data Source = [ServerName]; Initial Catalog = [DatabaseName]; User ID = [SqlUserName]; Password = [SqlUserPassword]";

        SqlConnection connection = null;

        try
        {
            connection = new SqlConnection(connectionString);
            connection.Open();
        }
        catch
        {
            Console.WriteLine("DataBase is not reachable....");
        }

        return connection;

    }

    public DataTable Execute(string queryString)
    {
        SqlConnection connection = OpenConnection();

        SqlCommand query = new SqlCommand(queryString, connection);

        DataTable resultTable = new DataTable();

        SqlDataAdapter adopter = new SqlDataAdapter(query);

        adopter.Fill(resultTable);

        connection.Close();

        return resultTable;
    }
}

string query = "Select Name From YourTableName Where Age = 25";
DBManagement manage = new DBManagement();

DataTable result = manage.Execute(query);