I want filter dataset using two dates

Question

dt2 = ds.Tables[0].Select().Where(p => (Convert.ToDateTime(p["SignupDate"]) >= Convert.ToDateTime(txtFMinDate.Text)) && (Convert.ToDateTime(p["SignupDate"]) <= Convert.ToDateTime(txtFMaxDate.Text))).CopyToDataTable();

 

I want Above statement in the below format(This is not working). 

 

DataView dataView = ds.Tables[0].DefaultView;

string where="";

where = "SignupDate >='" + Convert.ToDateTime(txtFMinDate.Text) + "'" + " AND SignupDate <='" + Convert.ToDateTime(txtFMaxDate.Text) + "'";

dataView.RowFilter = where;

DataTable dt = dataView.ToTable();

Filterds.Tables.Add(dt);

 

So, i want the perfect format.