Reading Data Through SqlDataReader

Sir,

working with c#,

I am reading the data from database using SqlDataReader, but it's give me an error regarding syntax error [System.Data.SqlClient.SqlException: Incorrect syntax near '='.] the following error on SqlDataReader dr = cmd.ExecuteReader();.

public void fillnews()
    {
        SqlConnection con = new SqlConnection(constr());
        SqlCommand cmd = new SqlCommand();
        cmd = new SqlCommand("select * from latestupdates id=" + Request.QueryString["lid"], con);
        con.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        if(dr.HasRows)
        {
            while (dr.Read())
            {
                tdetails.Text = dr["details1"].ToString();
            }
        }
    }