Getting the specified username of windows credentials (Windows Vault) - windows

Question

The following problem is happening. Our company is changing all the passwords of the users.
They asked me to write a program so that the user can enter his or her's username and new password so this will be replaced in the windows credentials manager. (Windows Vault).
What I am trying to do is to get all the stored credentials in the credential manager with a specified username. When I find the username I will edit the password.
I do not know the Target name so I cannot find the credentials with a Target name.
I made the following script with https://www.nuget.org/packages/CredentialManagement/:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using CredentialManagement;
using System.Diagnostics;
using System.Security;
using Microsoft.Win32.SafeHandles;
namespace RU_PWReplacer
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
GetCredentials();
}
public void GetCredentials()
{
List<Credential> Credentials = new List<Credential>();
List<string> TargetPath = new List<string>();
TargetPath.Add("test1.nl");
TargetPath.Add("test2.nl");
TargetPath.Add("test3.nl");
for (int i = 0; i < TargetPath.Count; i++)
{
Credential Try_ToFind_Credential = new Credential { Target = TargetPath[i], Type = CredentialType.DomainPassword };
Credentials.Add(Try_ToFind_Credential);
}
foreach (Credential c in Credentials)
{
if (!c.Exists())
{
Console.Write("Not Found\n");
}
else
{
Console.Write("Found\n");
}
}
}
}
}
The problem is that this way I am searching with a Target name and that is not a possibility, because there can be a lot of target names. So searching for a Username is more efficient.
If have found this post: How do I store and retrieve credentials from the Windows Vault credential manager?
The problem with this is that it still uses a Target name to find the credential.
I hope you guys can point me in the right direction.
With kind regards,
Dennis.