Pass (Send) BASE64 string to server side using jQuery AJAX in ASP.Net

Hi Team,

I am uploading an excel and sending the data as base64string to Webmethod in ajax call, but I am getting 400 bad request.

If i send as a regular string then no issue but if I send as base64 string then getting 400 error. Could anyone help me on this?

Note:

1)If data is normal string no issue, but I need base64 string only

2) File type should be excel only 3) I tried stringfy but no luck Thanks in Advance.