C# – How to download a file through the application

Hai Guys.,

Im doing an Application titled Online Education. In my application i have to enable the trainees to download the pdf tutorials that i've been already stored in database.How can I do this process using C#.Net..,

Thanks in advance for those who answer this question….,

Shankar.

Best Answer

So you are already putting your file in DB?

To allow users download file you should use Response.BinaryWrite. You will also need to send some special headers to user.

All in all the code looks like this:

  Response.ContentType = "Application/pdf";
  Response.AppendHeader( "content-disposition", "attachment; filename=" + name );
  Response.BinaryWrite(data);
  Response.End();

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C# – How to cast int to enum

From an int:

YourEnum foo = (YourEnum)yourInt;

From a string:

YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);

// The foo.ToString().Contains(",") check is necessary for enumerations marked with an [Flags] attribute
if (!Enum.IsDefined(typeof(YourEnum), foo) && !foo.ToString().Contains(","))
{
    throw new InvalidOperationException($"{yourString} is not an underlying value of the YourEnum enumeration.")
}

Update:

From number you can also

YourEnum foo = (YourEnum)Enum.ToObject(typeof(YourEnum) , yourInt);

C# – How to enumerate an enum

foreach (Suit suit in (Suit[]) Enum.GetValues(typeof(Suit)))
{
}

Note: The cast to (Suit[]) is not strictly necessary, but it does make the code 0.5 ns faster.

Best Answer

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C# – How to cast int to enum

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