use lambda like a parameter

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C#

Good morning.

i have a problem with my code in c#.

this below is the right code(i can take the var name end so have string varName="E01020003") :

public void writeTest()
{
  varName = getVarName(() => E01020003); 
  ...
  ...
}

public string VarName<T>(Expression<Func<T>> expr)
        {
            var body = ((MemberExpression)expr.Body);
            return body.Member.Name;
        }

these two methods are in the same file .cs


i would like to to this:
FILE1:

public void Write()
{
    ...
    ...
    ...
    file2.Write(userCred, E01020018, () => E01020003, (int)Type.Info, "test");
}

FILE2:
public bool Write(UserCredentials userCredentials, string ErrorText, Expression<Func<T>> expr, int type, string infoText)
{
    bool returnValue = true;

    var body = ((MemberExpression)expr.Body);

    string varName = body.Member.Name;
    ...
    ...
    ...
}

is it possible? i have problem to pass a lambda like a parameter.
problem 1 in the call

file2.Write(userCred, E01020018, () => E01020003, (int)Type.Info, "test");

and in the method called:

Write(UserCredentials userCredentials, string ErrorText, Expression<Func<T>> expr, int type, string infoText)

Best regards