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ASP.NET interview questions: - Describe how can we Browse and Upload a file in ASP.NET?

By Shiv Prasad Koirala in ASP.NET
Sep 28th, 2011
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This not one of those most asked ASP.NET questions , but yes sometimes   interviewer starts getting in to practical things to understand how good you are as a developer.

So let's see a small and simple example to understand it in better manner.

In order to see it practically just follow the following steps.

Step1: - create a new project of ASP.NET for that just go to >>    File >> New >> Project >> Web >> select ASP.NET   Empty Web Application.

Step2: - now, just simply add a Web form page in to your application for that just go to >> Solution Explorer >> Right click on the project name >> Add >> New Item >> Select Web Form.

Step3: - Now Add a FileUpload control and Button   control from the ToolBox to the WebForm.aspx Page.

The WebForm.aspx page should appear like below diagram.

Step4: - Now simply just add the below code snippet in to WebForm1.aspx.cs file.

protected void Button1_Click(object sender, EventArgs e)

if ((FileUpload1.PostedFile != null) && (FileUpload1.PostedFile.ContentLength > 0))

string filename = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
string location = Server.MapPath("")+"\\"+filename;
try

FileUpload1.PostedFile.SaveAs(location);
Label2.Text="The File has been successfully uploaded";
}
catch (Exception ex)

Label2.Text = "Error : " + ex.Message.ToString();
}
}
else

Label2.Text = "Please Enter a File";
}
}

The above code snippet is for the Button control for uploading the   selected file to the server.

Once you have completed all the above steps just run your application to get   a resultant result.

The above diagram is the running page we have created, now just click on the   browse button to select a file from desired location.