简单的C＃检查？

Question

我是新来的C＃和制作简单的接触形式，现在我的观点得到这个

 @{ 


    var customerName = Request["customerName"]; 
    var customerEmail = Request["customerEmail"]; 
    var customerRequest = Request["customerRequest"]; 
    var errorMessage = ""; 
    var debuggingFlag = false; 
    try { 
     // Initialize WebMail helper 
     WebMail.SmtpServer = "your-SMTP-host"; 
     WebMail.SmtpPort = 25; 
     WebMail.UserName = "your-user-name-here"; 
     WebMail.Password = "your-account-password"; 
     WebMail.From = "your-email-address-here"; 

     // Send email 
     WebMail.Send(to: customerEmail, 
      subject: "Help request from - " + customerName, 
      body: customerRequest 
     ); 
    } 
    catch (Exception ex) { 
     errorMessage = ex.Message; 
    } 
} 

这是确定的了，但如何在POST varibales检查存在，我知道在PHP

if (isset($_POST["customerName"]) && !empty($_POST["customerName"])) { 
} 

很容易，但如何做，在C＃

Answer 1

检查它反对null像：

if(Request["customerName"] != null) 
{ 
//Post key exists 
}