How to store large txt file and covert into binary

Question

i am trying to uploading the txt file near 1 GB

 

i modify the Web.config file but

 

<httpRuntime targetFramework="4.5" maxRequestLength="1048576"/>

<security>

<requestFiltering>

<requestLimits maxAllowedContentLength="1073741824" />

</requestFiltering>

</security>

protected void Upload(object sender, EventArgs e)
{
    string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
    string contentType = FileUpload1.PostedFile.ContentType;
    using (Stream fs = FileUpload1.PostedFile.InputStream)
    {
        using (BinaryReader br = new BinaryReader(fs))
        {
            br.ReadBytes((Int32)fs.Length) );
            // At this line i got the errorr msg
            byte[] bytes = br.ReadBytes((Int32)fs.Length);
             string constr = ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr))
            {
                string query = "insert into Files values (@Name, @ContentType, @Data)";
                using (SqlCommand cmd = new SqlCommand(query))
                {
                    cmd.Connection = con;
                    cmd.Parameters.AddWithValue("@Name", filename);
                    cmd.Parameters.AddWithValue("@ContentType", contentType);
                    cmd.Parameters.AddWithValue("@Data", bytes);
                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();
                }
            }
        }
    }
    Response.Redirect(Request.Url.AbsoluteUri);
}