Value from TextBox into Class C#

Question

I'm new to c# so maybe I'm wondering a stupid question. I'm trying to get a value from a textBoxFirstname. and get the value into ClassRegistrate.

The reason for this is because I have a Stored Procedure that will put the values that the User writes in textboxUsername into a sql table. But is there any way to check if the value that the user enters in the textBoxUsername enters the classRegistrate?

this is how it looks in my btnRegistrate_click event:

ClassRegistrate registrate = new ClassRegistrate(); 
   
private void btnRegistrate_Click(object sender, EventArgs e)
    {
        
        registrate.FName = textBoxUsername.Text;
    }

And this is what my class look like:

public class ClassRegistrate
{
    private string fname;

    public string FName
    {
        get { return fname; }
        set { fname = value; }
    }
}

why wont it get the value from my textBox? thanks for the help

Answer 1

// Define the class ClassRegistrate outside a method 
// so that it can be accessed by other methods
// Therefore it has a bigger scope
private ClassRegistrate registrate2 { get; set; }

private void startBtn_Click(object sender, EventArgs e)
{
    //ClassRegistrate registrate = new ClassRegistrate();
    //This class definition above will only be accessed inside the function
    //Therefore it has a smaller scope which is limited to this function alone
    
    // assign the class that you already created
    registrate2 = new ClassRegistrate();
    registrate2.FName = textBoxUsername.Text;

    MessageBox.Show(registrate2.FName);
}

public class ClassRegistrate
{
    private string fname;

    public string FName
    {
        get { return fname; }
        set { fname = value; }
    }
    
    //MessageBox.Show(FName);
    //that is a statement and can only exist/executed inside a method/function
}

Example:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    // Define the class ClassRegistrate outside a method 
    // so that it can be accessed by other methods
    private ClassRegistrate registrate { get; set; }

    // 1st Button
    private void AssignValue_Click(object sender, EventArgs e)
    {
        registrate = new ClassRegistrate();
        registrate.FName = textBox1.Text;
    }

    // 2nd Button
    private void CheckValue_Click(object sender, EventArgs e)
    {
        textBox2.Text = registrate.FName;
        MessageBox.Show(registrate.FName);
    }

    public class ClassRegistrate
    {
        private string fname;
        public string FName
        {
            get { return fname; }
            set { fname = value; }
        }
    }
}

Output: