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To utilize entities and a public static user to make updates in the database in the button_Click function, you can follow these steps:

1. Instantiate an object of the DbContext class and pass the connection string as a parameter to the constructor. For example:

using (var context = new MyDbContext(connectionString))
{
   // Perform database operations
}

1. Retrieve the user record from the database using the user id stored in the public static user variable. For example:

var user = context.Users.FirstOrDefault(u => u.Id == MyStaticClass.CurrentUserId);

1. Make the necessary updates to the user object. For example:

user.FirstName = "John";
user.LastName = "Doe";

1. Save the changes to the database using the SaveChanges method on the DbContext object. For example:

context.SaveChanges();

The complete code for the button_Click function would look something like this:

private void button_Click(object sender, EventArgs e)
{
    using (var context = new MyDbContext(connectionString))
    {
        var user = context.Users.FirstOrDefault(u => u.Id == MyStaticClass.CurrentUserId);
        if (user != null)
        {
            user.FirstName = "John";
            user.LastName = "Doe";
            context.SaveChanges();
        }
    }
}