Pass string variable to Linq query WHERE clause using C# and VB.Net in ASP.Net

Hi,

I have used linq query to c# query. 

Is that any way to execute string like ("from c in customers sectect c ") as linq to SQL 

string str="pats.Id && sups.SupplierName && pats.PatternName";

string str passed the where clause but str throw error.

please help me.

for example:-

var results = from reqs in dataContext.Requirements
join pats in dataContext.Patterns on reqs.PatternRequirement equals pats.Id
join sups in dataContext.Suppliers on reqs.SupplierRequirement equals sups.Id
Where (str)
select new
{
    reqs.Id,
    sups.SupplierName,
    pats.PatternName
};