C#連接SQLServer數據庫

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

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

//這個是連接數據庫用的類

namespace SQLConnectWindows
{
    class sqlhelper
    {
        //數據庫名稱
        public  string sourceName = "UQVYNFZSKG81DQB";
        //用戶名稱
        public  string userName = "sa";
        //用戶密碼
        public  string pwd = "123456";
        //連接的數據庫名稱
        public  string database = "zd_tcTwo";
        //連接數據庫
        SqlConnection conn;
        //執行操作
        DataSet dataSet = new DataSet();
        
        public DataSet MySQLConnect(string sql)
        {
            //連接數據庫
            string connstr = "data source=" + sourceName + ";user=" + userName + ";pwd=" + pwd + ";database=" + database;
            conn = new SqlConnection(connstr);

            try
            {
                //打開數據庫連接
                conn.Open();

                //執行sql命令
                SqlCommand cmd = new SqlCommand(sql, conn);


                //適配命令通道
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                
                //命令執行
                adapter.Fill(dataSet);

                //清除參數
                cmd.Parameters.Clear();
                
            }
            catch (Exception e)
            {
                Console.Write(e.Message);
            }
            finally {
                //關閉數據庫連接
                conn.Close();
            }
            return dataSet;
        }
    }
}

執行SQL語句：在方法中調用

//可以存在於其他類中
private void button1_Click(object sender, EventArgs e)
        {
            try {
                string cmd = "INSERT INTO [dbo].[userInfo]([uid],[uname],[umid])VALUES('" + 1 + "','" + 1 + "','" + 1 + "')";
                sqlhelper.MySQLConnect(cmd);
            }
            catch (DataException data) {
                Console.Write(data.Message);
            }
        }