How to specify file extension in ASP.Net upload control?

Question

Is there a way to specify a file extension for ASP.NET upload control? E.g. I want to upload images with jpg and png extensions only.

I can implement this easily for a windows application, but struggling with ASP.Net

Thank you

Answer 1

string[] validFileTypes = { "bmp", "jpg", "png" };
    string ext = Path.GetExtension(fileUpload1.FileName);
    bool isValidType = false;

    for (int i = 0; i < validFileTypes.Length; i++)
    {
        if (ext == "." + validFileTypes[i])
        {
            isValidType = true;
            break;
        }
    }

    if (!isValidType)
    {
        lblMessage.Text = "Invalid File Type";
    }
    else
    {
        lblMessage.Text = "File Uploaded Successfullty";
    }