Clear Datepicker's value after clicking the submit button in xamarin form - xamarin.forms

Question

My problem is, the data which is date entered by user is doesn't after submit button. So I have fields in my registration page and A button to save in my database.
This is what I've tried.
//My Datepicker Design
`
<local:BirthdayDatePickerControl
TextColor="Black"
x:Name="entryField_DateOfBirth"
/>
`
The purpose that I create a custom control in my datepicker is to put an placeholder iny my datepicker field.
//my Birthdaypickercontrol.cs
`
public class BirthdayDatePickerControl : DatePicker
{
public event EventHandler ClearRequested;
// for my placeholder "birthdate"
public static readonly BindableProperty EnterTextProperty = BindableProperty.Create(propertyName: "Placeholder", returnType: typeof(string), declaringType: typeof(BirthdayDatePickerControl), defaultValue: default(string));
public string Placeholder { get; set; }
//function to clear data of my datepicker input
public void clear()
{
if (ClearRequested != null)
{
ClearRequested(this, EventArgs.Empty);
}
}
}
`
In my project.android, I create a birthday renderer.cs
//so this is my code
`
[assembly: ExportRenderer(typeof(BirthdayDatePickerControl), typeof(BirthdayDatePickerRenderer))]
public class BirthdayDatePickerRenderer : DatePickerRenderer
{
public BirthdayDatePickerRenderer(Context context) : base(context)
{
}
EditText editText;
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.DatePicker> e)
{
base.OnElementChanged(e);
//code for placeholder
if (Control != null)
{
Control.Text = "Birth Date";
}
//end here
//code start here for clearing the data in datepicker input field
editText = Control as EditText;
if (e.NewElement != null)
{
BirthdayDatePickerControl bdaydatePickerControl = e.NewElement as BirthdayDatePickerControl;
bdaydatePickerControl.ClearRequested += DatePickerControl_ClearRequested;
}
//end here
}
public void DatePickerControl_ClearRequested(object sender, EventArgs e)
{
editText.Text = string.Empty;
}
}
`
The codes I pasted will anyway, but..
Assuming in the onload of my registration page, The UI will be like this( pic for reference and ctto to google). After user choose birthdate, example 12/1/22 and hit submit button(all data save in to database). The problem is the placeholder "birthdate" remove/disappear Like this, then if I click the datepicker input field to check the date, the date is still pointing in 12/1/22. What I expected is after performing the ClearData(), the date should be reset in today's date.
//this is my ClearData() function
`
public void ClearData()
{
entryField_DateOfBirth.clear();// this is what I tried and got an bad ouput
}
`

Answer 1

You said:
What I expected is after performing the ClearData(), the date should be reset in today's date.
public void DatePickerControl_ClearRequested(object sender, EventArgs e)
{
editText.Text = string.Empty;
}
Change to this:
public void DatePickerControl_ClearRequested(object sender, EventArgs e)
{
BirthdayDatePickerControl birthdayDate = sender as BirthdayDatePickerControl;
birthdayDate.Date = DateTime.Now;
editText.Text = "Birth Date";
}