How do I show a message inside dropdownlist?

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Here is what I am trying to do. When page loads and RequestorDropDownList is populated the first name is displayed.
What I want to do is instead of the name displayed, I want to display message <-Please select Requestor->.
When the user click on dropdownlist and select a name, then the name selected by the user will be displayed.

I have my method here. What do I need to add and how?

I also played with this code inside the method but it did not work

C#

List<GetRequestorInfoModel> requestors = new List<GetRequestorInfoModel>();
RequestorDropDownList.Items.Clear();
DropDownList firstRequestor = new DropDownList();
firstRequestor.Text = "<-Please select Requestor->";
firstRequestor.SelectedIndex = 0;

What I have tried:

My aspx code

C#

<asp:DropDownList ID="RequestorDropDownList" runat="server" Font-Size="8.25pt" 
     Height="20px" ToolTip="Requestor" Width="160px" SelectMethod="GetRequestorEmail"
     DataTextField="DisplayName" DataValueField="Email">
</asp:DropDownList>

Here is my code behind

C#

#region Requestor dropdownlist
        public async Task<IEnumerable<GetRequestorInfoModel>> GetRequestorEmail()
        {
            try
            {
                var requestors = await FTACaseReseting.Controllers.RequestorInfoController.GetAllRequestorInfoes();
                return requestors.OrderBy(x => x.DisplayName);
            }
            catch (Exception ex)
            {
                string errorMsg = string.Format("An error has occured in {0}. \nException:\n{1}", "PopulateRequestorComboBox()", ex.Message);
                Response.Write("<script>alert(" + HttpUtility.JavaScriptStringEncode(errorMsg, true) + ")</script>");
                return Enumerable.Empty<GetRequestorInfoModel>();
            }
        }
        #endregion

Posted 20-Dec-19 6:49am

Member 11403304

Updated 31-Dec-19 0:20am

v2

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tninis · Answer 1 · 2019-12-31T00:20:00

Maybe you can convert your requestors result into List<> then add what you need to show and then return.
For example :

public IEnumerable<Person> GetRequestorEmail2()
{

  List<Person> personList = new List<Person>();
  personList.Add(new Person { Something = "asd", Something2 = "0" }); 
  personList.Add(new Person { Something = "asd", Something2 = "1" });

//here add what you want 
  personList.Add(new Person {Something= "<-Please select Requestor->", Something2="-1"});

  return personList.OrderBy(x=>x.Something);

}