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yes, use FindControl method as OMC2000 suggested.<br />
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you can read further article below when necessary:<br />
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ASP.NET Web Form User Control's Basic Interaction<br />
<a href="https://www.experts-exchange.com/articles/31726/ASP-NET-Web-Form-User-Control's-Basic-Interaction.html" rel="ugc">https://www.experts-exchange.com/articles/31726/ASP-NET-Web-Form-User-Control's-Basic-Interaction.html</a>
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yes, use FindControl method as OMC2000 suggested.

you can read further article below when necessary:

ASP.NET Web Form User Control's Basic Interaction
https://www.experts-exchange.com/articles/31726/ASP-NET-Web-Form-User-Control's-Basic-Interaction.html [https://www.experts-exchange.com/articles/31726/ASP-NET-Web-Form-User-Control's-Basic-Interaction.html]

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How to get/read a control's value from an ascx page to am aspx page?
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How to get/read a control's value from an ascx page to am aspx page?

ASCX to aspx

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications

ASP.NET

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).