There is no error but why SqlDataReader returns null.

public bool CheckLogin(string uname,string passwd)
{
    bool ans = false;
    SqlConnection conn = new SqlConnection();
    conn.ConnectionString = @"data source=localhost\SQLEXPRESS01;initial catalog = PractPro1;integrated security=true;";
    conn.Open();
    string strsql = "select * from UserDetails where UserName="+ uname +" and Passwd="+ passwd ;
    SqlCommand cmd = new SqlCommand(strsql,conn);
    SqlDataReader dr = cmd.ExecuteReader();

    if (dr.Read())
        ans = true;

    conn.Close();
    return ans;
}

database :

create database PractPro1
go
use PractPro1
go
create table UserDetails(
    UserId int identity primary key,
    UserName varchar(50) not null,
    Passwd varchar(50) not null,
    DOB varchar(50) not null
)
go
insert into UserDetails values('neha','neha','22-08-1995')