如何在C#中修改数据表

using System;
using System.Data.SqlClient;

class Program
{
    static void Main()
    {
        // 数据库连接字符串
        string connectionString = "Server=your_server;Database=your_database;User Id=your_username;Password=your_password;";

        // SQL命令文本
        string sql = "UPDATE YourTable SET ColumnName = @newValue WHERE ConditionColumn = @conditionValue";

        // 创建SqlConnection对象
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            // 打开连接
            connection.Open();

            // 创建SqlCommand对象
            using (SqlCommand command = new SqlCommand(sql, connection))
            {
                // 添加参数
                command.Parameters.AddWithValue("@newValue", "New Value");
                command.Parameters.AddWithValue("@conditionValue", "Condition Value");

                // 执行SQL命令
                int rowsAffected = command.ExecuteNonQuery();

                // 输出受影响的行数
                Console.WriteLine("Rows affected: " + rowsAffected);
            }
        }
    }
}