How to clear ClientPeoplePicker field from a button click event handler?

Question

I am building a custom form that includes a ClientPeoplePicker control.

When the user press the Clear button, all the fields in the forms should be reset to empty/initial status. I can do this for all the fields except the ClientPeoplePicker one.

Following is the current handler I am using for the button click event:

 protected void ClearBtn_Click(object sender, EventArgs e)
 {
     txtEmpFName.Text = string.Empty;
     txtEmpEGN.Text = string.Empty;
     dropDep.SelectedIndex = 0;
     dtStartDate.SelectedDate = new DateTime(0);

     PickerEntity picker = (PickerEntity)peoplePicker.ResolvedEntities[0];
     SPUser userInstance = oSPWeb.EnsureUser(picker.Key);
     userInstance.Name = string.Empty; // <------| This is my problem...
 }

As a reference, this is the relevant code for the picker control:

<td>
    <SharePoint:ClientPeoplePicker
         Required="true"
         ValidationEnabled="true"
         ID="peoplePicker"
         runat="server"
         InitialHelpText="Please, insert a valid User!"
         VisibleSuggestions="3"
         Width="180px"
         Rows="1"
         AllowMultipleEntities="false"
         CssClass="ms-long ms-spellcheck-true" />
 </td>

Answer 1

PeoplePickerControlName.AllEntities.Clear();

Answer 2

Just add this single line of code which will clear the PeoplePicker field.

peoplePicker.CommaSeparatedAccounts = null;

You don't need below lines in your code to clear peoplepicker

PickerEntity picker = (PickerEntity)peoplePicker.ResolvedEntities[0];
SPUser userInstance = oSPWeb.EnsureUser(picker.Key);
userInstance.Name = string.Empty;

Answer 3

you can give a try

PeopleEditor.Accounts.Clear();
PeopleEditor.Entities.Clear();
PeopleEditor.ResolvedEntities.Clear();

works on fly.