How to calling Get method of Sq-lite?

Hello everyone,

I have one method in Repository class i want to call that from my registration class

method is-->

public async Task Get(Expression> predicate)

{

return await _db.FindAsync(predicate);

}

how can i call that one. i'm trying like that

{

Repository repo = new Repository();

Registration Entity_Reg = new Registration();

string query = "select * from registration where fname=" + txtUame.Text + "and Password=" + txtPass.Text + "";

var result = repo.Get(query,____);

}

it is showing error.

please tell me how to call this method in proper way.