combobox return with 'text'

In C# double quotes are used to enclose string literals. So here "TEXT" is a string literal. The double quotes will not appear when this string is written to UI or printed to an out put medium say Report or a File. eg.

Label1.Text = "TEXT";
System.IO.File.WriteAllText(fileName,"TEXT");

If the double quotes are removed then it will represent a variable which can hold the value of premitive data type or an object which may be an instance of struct or class etc.

var TEXT = "This is text";
var TEXT = new MyClass();

If your requirement is to use the string value returned as a variable then the Reflection may be helpful and these articles
Reflection (C# Programming Guide)[^]
Reflection in .NET[^]
Reflection in C# Tutorial[^]
may be helpful.