specify path leading to a folder within the .net project

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.NET3.0

.NET

I am stuck. Please help me out.
1.its a web application in c#.net and my aim form the code below is to make two xml files, one of public key and another private key and place them in a folder within the project(here I have named it f_upload and f_upload1)but it's not happening
2.this code is not choking any error but not producing the desired files
3.is the problem on the line #1 and #2? What would be the correct line?
4.leaving #1 and #2 is the rest of the code okay to generate the desired files?

public class Class1
{
	
		public static bool GenerateRsa(int size)
        {
          /* #1 */  string privateKeyPath =  System.Web.HttpContext.Current.Server.MapPath("f_upload\\");
           /* #2 */ string publicKeyPath  = System.Web.HttpContext.Current.Server.MapPath("f_upload1\\"); 

        
    //stream to save the keys
    FileStream fs = null;
    StreamWriter sw = null;

    //create RSA provider
    RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(size);
    try
    {
        //save private key
        fs = new FileStream(privateKeyPath, FileMode.Create, FileAccess.Write);
        sw = new StreamWriter(fs);
        sw.Write(rsa.ToXmlString(true));
        sw.Flush();
    }
    finally
    {
        if (sw != null) sw.Close();
        if (fs != null) fs.Close();
    }

    try
    {
        //save public key
        fs = new FileStream(publicKeyPath, FileMode.Create, FileAccess.Write);
        sw = new StreamWriter(fs);
        sw.Write(rsa.ToXmlString(false));
        sw.Flush();
    }
    finally
    {
        if (sw != null) sw.Close();
        if (fs != null) fs.Close();
    }
    rsa.Clear();
    return true;
}