404 error when redirecting the URL with encoded querystring

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C#

ASP.NET

i have couple of strings and they are encoded using below code

protected void page load()
{
DataTable dt = new DataTable();
               
 dt.Columns.Add("a");
 dt.Columns.Add("b");
 dt.Columns.Add("c");
 dt.Columns.Add("d");
 dt.Columns.Add("e");
 dt.Columns.Add("f");
              
 dt.Rows.Add("value1","value2","value3","value4");

 byte[] ba = ConvertToBytes(dt);

 string data = Convert.ToBase64String(ba);
 string dataEncoded = Server.UrlEncode(data);

Response.Redirect("http://www.project.com/page1.aspx?q=" + dataEncoded, false)

}


  public static byte[] ConvertToBytes(Object obj)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                BinaryFormatter bf = new BinaryFormatter();
                bf.Serialize(ms, obj);
                return ms.ToArray();
            }
        }

What I have tried:

The code is encoding and it is redirecting to the page specified in response.redirect .
but after redirecting it is showing 404 file or directory not found error,

but the Page1.aspx is active in live.
if i have omitted the query string and redirects the page it is loading correctly.

can someone help me regarding this