使用C#打印SQL Server数据库中的单值

using System.Data.SqlClient;

string connectionString = "Data Source=<服务器名称>;Initial Catalog=<数据库名称>;User ID=<用户名>;Password=<密码>";
SqlConnection connection = new SqlConnection(connectionString);

connection.Open();

string query = "SELECT columnName FROM tableName WHERE condition";
SqlCommand command = new SqlCommand(query, connection);

object result = command.ExecuteScalar();

if (result != null)
{
    Console.WriteLine(result.ToString());
}

connection.Close();