c# - FileUpload does not contain the file when popup open

Question

after upload the file then upload button click it shows the msg if already file exits do you want overwrite it? here i used the popup and cancel control id but i want use ok button and then press the ok button load the file and overrite the old one how to write the code in asp.net using c#

Answer 1

对于检查存在文件，您可以使用此代码

var folderfile4 = Server.MapPath("~/files/Path");
string saveflFile4 = folderfile4 + "\\" + System.IO.Path.GetFileName(flFile4);
if(!File.Exists(saveflFile4))
    txtFile4.SaveAs(saveflFile4);
else
    txtError.Text = "File exists";