C# 如何在c代码中添加占位符？

如何在c代码中添加占位符？我想在我的表单中显示DateTime

<div class="col-md-10">
  @Html.EditorFor(model => model.Date,  new { htmlAttributes = new { @class = "form-control"  } })
  @Html.ValidationMessageFor(model => model.Date, "", new { @class = "text-danger" })
</div>

@EditorFor（model=>model.Date，new{htmlAttributes=new{@class=“form control”}）
@Html.ValidationMessageFor（model=>model.Date，“，new{@class=“text danger”}）

您是否已尝试-

  @Html.EditorFor(model => model.Date, new { placeholder =  DateTime.Now.ToString("MM/dd/yyyy")})

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请描述一下你提出的解决方案。我确实在我的评论中解释了我自己。

/** Here is how I did it in my code. I had a richtexBox5 that I needed to add QTY placeholder. So what did was, inside public form i did the following */
  public Form1()
        {
            InitializeComponent();

         richTextBox5.Text = "QTY";// set text you want to show

         if (richTextBox5.Text == "QTY")
            {
             richTextBox5.ForeColor = Color.LightGray;// set color
           }
        }

/**now make this function which will listen to mouse click  in wherever part you want*/
 private void richTextBox5_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {           
            if(richTextBox5.Text=="QTY") // check what is in that textbox
            {
                richTextBox5.Text = "";// set it to null 
                richTextBox5.ForeColor = Color.Black;// change color
            }      
        }