It is used to show the content of any file in web browser. This is same as response.write but it will write the content of the file to web page. Mainly it is used to view the file content not to download the file. Both Response.WriteFile or Response.TransmitFile are same
example if text file than use code below
For PDF file
Response.ContentType = System.Net.Mime.MediaTypeNames.Application.Pdf;
Response.WriteFile(Server.MapPath("~/App_Data/Annexure.pdf"));
For txt file
Response.Clear();
Response.ContentType = System.Net.Mime.MediaTypeNames.Text.Plain; and use Text.html
//"application/octet-stream";
Response.WriteFile(Server.MapPath("~/App_Data/yash.txt"));
Response.End();
or on page load, simply we can show the content of text file
Response.WriteFile("~/App_Data/" + fileName);
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