how to creat login In C# using MS as database

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C#

hello ,
i created database using MS access
contain Admin table{adminID, usertype, username, userpassword}
and staff table {staffID, password ....etc}, i want to create login form in C#
if the user is admin can login and can add staff's ID and put a password for them... also the staff can login by their ID and their own password.

please help i'm getting errors

public partial class Form1 : Form
{
     
   private void Button2_Click_1(object sender, EventArgs e)
   {
      this.Close();
   }
   
   private void btnlogin_Click(object sender, EventArgs e)
   {
      OleDbConnection connection = new OleDbConnection(); 
      connection.ConnectionString =@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Users\sss\Documents\Visual Studio 2010\Projects\eee1\eee1\EMP.accdb;adminId=admin;";
      connection.Open();

      OleDbCommand command = new OleDbCommand("SELECT * FROM Admin", connection); 
      OleDbDataReader reader = command.ExecuteReader(); 
      
      try
      {
         while (reader.Read()) 
         {
            txtuname.ToString();
            txtupass.ToString();

            if (txtuname.Text =="admin" &&txtupass.Text =="admin") 
            {
               this.Hide(); 
               new MainForm().Show();
               break; 
            }
            else
            {
               MessageBox.Show("UserName/Password doesnt exist"); 
               break; 
            }
         }
      }
      catch (Exception err) 
      {
         MessageBox.Show(err.Message); 
      }
      finally
      {
         connection.Close();
         command.Dispose();
         connection.Dispose();
      }
   }
}