How to preview an image before downloading from server in c#

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How to preview an image before downloading from server in C# when we are having id of file in query string.

What I have tried:

how to preview an image before downloading from server in C# when we are having id of file in query string

Posted 15-Feb-16 20:06pm

Member 11954311

Updated 15-Feb-16 20:51pm

Sibeesh Passion

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Sinisa Hajnal 16-Feb-16 2:38am

Simple answer is you don't. You didn't describe what you've tried. You didn't mention anything about your code. You cannot show anything client side if it is not downloaded from the server first. What you CAN do is make the preview very small (thumbnail image) and send it as part of html (via 64base encoding)

Suvendu Shekhar Giri 16-Feb-16 3:15am

What is use of pasting the same line once again with a different heading "What I have tried"?
If you really want help, help us to understand your problem correctly.

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Member 11954311 · Accepted Answer · 2016-02-16T19:35:00

I have tried same for pdf

but not able to do same in jpg

string id = Request["id"].ToString(); // getting from grid click by query string

string filename = "";
string addr = "";
string fpath = "";
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["OFcon"]);

con.Open();

string query = "select addr,filename from files where id=" + id + "";

SqlCommand cmd = new SqlCommand(query, con);
SqlDataReader rd = cmd.ExecuteReader();

if (rd != null)
{
if (rd.Read())
{
addr = rd.GetString(0);
filename = rd.GetString(1);
fpath = addr + filename;

}
}

con.Close();
string path = Server.MapPath(".");
string path1 = path + "\\" + fpath;
string viewpath = fpath;

string name = Path.GetFileName(fpath);
string ext = Path.GetExtension(fpath);
string FilePath = viewpath;
WebClient User = new WebClient();
Byte[] FileBuffer = User.DownloadData(FilePath);
if (FileBuffer != null)
{
Response.ContentType = "application/pdf";
Response.AddHeader("content-length", FileBuffer.Length.ToString());
Response.BinaryWrite(FileBuffer);
}
}