Pass Single Value from a User Control to Containing Page's Code Behind in C Sharp

I need to pass a value from the onload event of a user control to the onload event of the parent page. I have found this code on stackoverflow but I can't seem to get it to work/adapt it:

Public Property SomeValue() As String
Get
    Return textbox开发者_高级运维1.Text
End Get
End Property

The value I need to pass is a single int from a database.

 conn.Open();
 reader = comm.ExecuteReader();
 if (reader.Read())
 {
     shoppingCartHeadID = Convert.ToInt32(reader["shoppingCartHeadID"]);
     hfShoppingCartHeadID.Value = shoppingCartHeadID.ToString();
 }
 reader.Close();

You don't really need to pass anything. Just create a property on your user control and access it from the page:

protected void Page_Load(object sender, EventArgs e)
{
    string userControlValue = UserControl.UserControlValue;
}

its not the fine way, but if you realy now what you are doing there, you can try it with an property

mayby something like this:

//child uc class
...
public string MyValue { get; private set; }

//... loaded (...)
{
    ...
    this.MyValue = "Value";
}

// Parent uc class
//... loaded (...)
{
    ...
    string childValue = this.ucChildControl.MyValue;
}

This code:

Public Property SomeValue() As String
Get
Return textbox1.Text
End Get
End Property 

Looks like this in C#:

public String SomeValue {
 get{ return textbox1.text}
}

I think by the way that the child user control should set a property, what the parent user control should read.

//child
public string DatatoShare{get;set;}
protected override Onload()
{
DatatoShare = "Whatever you want"
base.Onload()
}

//parent
private ChildUserControl child;
public string NeedChildsData()
{
return child.DatatoShare
}

In the end I opted to create a separate public class to call and control the cart. This turned out to be much more efficient and cleaner code!

Thank you for your suggestions.