Javascript confirm messagebox is not firing gridview onrowdeleting event when ok button is clicked

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C#

ASP.NET

I am using grid view for editing and deleting the user account in the asp.net having SQL server database. I have done updating the record in the database and deleting as well but i require to show a confirmation message before deleting the record into the database.

For this i used gridview_rowupdating event and gridview_rowdeleting event. Confirm message box is displayed but when i click OK button in the confirm message box it doesn't take to fire the event gridview_rowdeleting event. I am just thinking it doesn't call the event that is why i initialized onclientclick event for asp button to call the confirm messagebox and it is getting the output but when i click OK button not firing anything.

I will share the code please anybody explain me the situation to handle this case

What I have tried:

ASP Button:

<asp:Button ID="btnDelete" runat="server" Text="Delete" CssClass="btn btn-link text-center" ToolTip="Delete User Details" CommandName="Delete" UseSubmitBehavior="false" CausesValidation="false"                                                             OnClientClick="return ConfirmDeletion();"  OnClick="btnDelete_Click" />

Javascript:

function ConfirmDeletion() {
debugger;
var confirm_value = document.createElement("INPUT");
confirm_value.type = "hidden";
confirm_value.name = "confirm_value";

if (confirm("Are you sure you want to delete the record?") == true)
    confirm_value = "Yes";
else
    confirm_value = "No";

}

Delete Button Code Behind for sample:

protected void btnDelete_Click(object sender, EventArgs e)
{
    string confirmValue = Request.Form["confirm_value"];
    if (confirmValue == "Yes")
    {
        this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('You clicked YES!')", true);
    }
    else
    {
        this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('You clicked NO!')", true);
    }
}