Entity framework, find by 1 or all properties

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.NET

EF4.0

entity-framework

Hi I need to find data in a table by one or all properties, my idea is to fill an entity and make a search by all properties if the parameter is not null

I have 2 ideas for this but i dont know if is posible for both cases.

If there is a better way im all ears too :P

Thanks and regards

First set an entity and use it to search.

public bool find(nullable<int>param1,nullable<string>param2,nullable<string>param3)
{

Entity e = new Entity(); 

e.prop1 = param1;
e.prop2 = param2;
e.prop3 = param3;

//here is what i dont know if is posible
var results = dbContext.....(e);

}

or my second idea was to ask if parameter is not null to add it to the query

public bool find(nullable<int>param1,nullable<string>param2,nullable<string>param3)
{

//here is what i dont know if is posible
var results = dbContext.where(
                         if (param1!=null) e=> e.prop1 == param1, 
                         if (param2!=null) e=> e.prop2 == param2,
                         if (param3!=null) e=> e.prop3 == param3);

}