C# sql查詢數據庫返回單個值方法

static string sqlServer= "server=.;database=DBsql;user id=sa;pwd=sa;";

#region 返回單個值
public static void refdange()
{
//實例化連接通道
SqlConnection conn = new SqlConnection(sqlServer);
//准備執行命令的字符串
string sqlStr = "select count(*) from work";
//准備執行命令
SqlCommand sqlcmd = new SqlCommand(sqlStr, conn);
//打開通道
conn.Open();
//執行命令並返回單個值
object objstr = sqlcmd.ExecuteScalar();
//關閉通道
conn.Close();
Console.WriteLine(objstr.ToString());
}
#endregion