How do I write a value that holds a string with lambda in C#?

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C#

lambda

Public void List()
{
   string x="";

foreach( var item in t)
{
    x=  ....
}

}

I want to write the string values ​​in my hand in lambda. But when I write as where I get an error.

What I have tried:

var c=MyStudent.tblStudent.Select(x=>x.tblPerson).Distinct().ToList();

I want to where condition string x variable including.
How to write string x variable.

Try To:

var c=MyStudent.tblStudent.Where(x).Select(x=>x.tblPerson).Distinct().ToList(); ////but where(x) is error.

How to lambda expression where condition in string variables.