Validate uploaded file extension

Question

Uploading files works fine but now I\'m trying to validate file extensions and looks like there\'s some interference between FileUpload1 and FileUpload2

Answer 1

bool CheckFileType(string fileName)
{
    string ext = Path.GetExtension(fileName);
    switch (ext.ToLower())
    {
        case ".gif":
            return true;
        case ".jpg":
            return true;
        case ".jpeg":
            return true;
        case ".png":
            return true;
        default:
            return false;
    }
}

if (CheckFileType(fuImage.FileName))
{
 //..........
}

or use RegularExpressionValidator:

<asp:RegularExpressionValidator 
     ID="regexValidateImageFil" runat="server" ControlToValidate="fuImage" 
     ErrorMessage="file type not allow." 
     ValidationExpression="^([0-9a-zA-Z_\-~ :\\])+(.jpg|.JPG|.jpeg|.JPEG|.bmp|.BMP|.gif|.GIF|.png|.PNG)$"></asp:RegularExpressionValidator>

Answer 2

are you uploading both files at the same time, or only one at a time? if it is only one at a time, then one of those values is always going to be false.

You are also adding a period in front of your validPhotoFile and validPDFFile, change your code like this.

for (int i = 0; i < validPhotoFile.Length; i++)
{
    if (photoExt == validPhotoFile[i]) // remove the period here it is already in your variables above
    {
        isValidPhotoFile = true;
        break;
    }
}

for (int i = 0; i < validPDFFile.Length; i++)
{
    if (pdfExt == validPDFFile[i]) // remove the period here it is already in your variables above
    {
        isValidPDFFile = true;
        break;
    }
}