c# upload download video file of any extension

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C#

I want to make upload of software from admin side of any extension and give access to only normal user from admin side by providing normal user separate userid and password for downloading the software.Any idea please help.

for upload i have used this

string filename = Path.GetFileName(fileUpload1.PostedFile.FileName);
fileUpload1.SaveAs(Server.MapPath("Files/"+filename));
conn.Open();
SqlCommand cmd = new SqlCommand("insert into upload(FileName,FilePath) values(@Name,@Path)",conn);
cmd.Parameters.AddWithValue("@Name",filename );
cmd.Parameters.AddWithValue("@Path", "Files/"+filename );
cmd.ExecuteNonQuery();
conn.Close();
BindGridviewData();
</pre>

for download used this

LinkButton lnkbtn = sender as LinkButton;
GridViewRow gvrow = lnkbtn.NamingContainer as GridViewRow;
string filePath = gvDetails.DataKeys[gvrow.RowIndex].Value.ToString();
Response.ContentType = "";
Response.AddHeader("Content-Disposition", "attachment;filename=\"" + filePath + "\"");
Response.TransmitFile(Server.MapPath(filePath));
Response.End();
</pre>

but it is not supporting video file and do you have idea whether how to give access for normal user from admin user to download software.By defining Roles may it solve the problem