I've been incredibly busy at work lately and I really will get back to this blog soon. Anyway, came across this little bit of code whilst combing through an old backup, it basically lets you make a file of any size with any name (file contains totally random, non-compressible data) - I used it for testing uploading functions - oh, it's a winforms app before I forget :-):
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Security.Cryptography;
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namespace DummyFileMaker
{
   /// <summary>
   /// Summary description for Form1.
   /// </summary>
   public class Form1 : System.Windows.Forms.Form
   {
      private System.Windows.Forms.TextBox FileSize;
      private System.Windows.Forms.Button MakeFileButton;
      private System.Windows.Forms.TextBox FilePath;
      private System.Windows.Forms.Label label1;
      /// <summary>
      /// Required designer variable.
      /// </summary>
      private System.ComponentModel.Container components = null;
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      public Form1()
      {
         //
         // Required for Windows Form Designer support
         //
         InitializeComponent();
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         //
         // TODO: Add any constructor code after InitializeComponent call
         //
      }
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      /// <summary>
      /// Clean up any resources being used.
      /// </summary>
      protected override void Dispose( bool disposing )
      {
         if( disposing )
         {
            if (components != null)
            {
               components.Dispose();
            }
         }
         base.Dispose( disposing );
      }
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      #region Windows Form Designer generated code
      /// <summary>
      /// Required method for Designer support - do not modify
      /// the contents of this method with the code editor.
      /// </summary>
      private void InitializeComponent()
      {
         this.FileSize = new System.Windows.Forms.TextBox();
         this.MakeFileButton = new System.Windows.Forms.Button();
         this.FilePath = new System.Windows.Forms.TextBox();
         this.label1 = new System.Windows.Forms.Label();
         this.SuspendLayout();
         //
         // FileSize
         //
         this.FileSize.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
            | System.Windows.Forms.AnchorStyles.Left)));
         this.FileSize.Location = new System.Drawing.Point(16, 8);
         this.FileSize.Name = "FileSize";
         this.FileSize.TabIndex = 0;
         this.FileSize.Text = "10";
         //
         // MakeFileButton
         //
         this.MakeFileButton.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
            | System.Windows.Forms.AnchorStyles.Right)));
         this.MakeFileButton.Location = new System.Drawing.Point(160, 40);
         this.MakeFileButton.Name = "MakeFileButton";
         this.MakeFileButton.TabIndex = 1;
         this.MakeFileButton.Text = "make file";
         this.MakeFileButton.Click += new System.EventHandler(this.MakeFileButton_Click);
         //
         // FilePath
         //
         this.FilePath.Location = new System.Drawing.Point(16, 40);
         this.FilePath.Name = "FilePath";
         this.FilePath.TabIndex = 2;
         this.FilePath.Text = "c:\\dummyfile.gif";
         //
         // label1
         //
         this.label1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
         this.label1.Location = new System.Drawing.Point(144, 8);
         this.label1.Name = "label1";
         this.label1.Size = new System.Drawing.Size(128, 23);
         this.label1.TabIndex = 3;
         //
         // Form1
         //
         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(292, 69);
         this.Controls.Add(this.label1);
         this.Controls.Add(this.FilePath);
         this.Controls.Add(this.MakeFileButton);
         this.Controls.Add(this.FileSize);
         this.MaximumSize = new System.Drawing.Size(300, 96);
         this.MinimumSize = new System.Drawing.Size(300, 96);
         this.Name = "Form1";
         this.Text = "Form1";
         this.ResumeLayout(false);
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      }
      #endregion
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      /// <summary>
      /// The main entry point for the application.
      /// </summary>
      [STAThread]
      static void Main()
      {
         Application.Run(new Form1());
      }
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      private void MakeFileButton_Click(object sender, System.EventArgs e)
      {
         label1.Text = "Creating file: " + FilePath.Text;
         using(FileStream fle = new FileStream(FilePath.Text,FileMode.Create,FileAccess.Write,FileShare.None,4096,false))
         {
            double numBytes = Convert.ToDouble(FileSize.Text) * (1024 * 1024);
            byte[] bytArr = new byte[(int)numBytes];
            RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
            rng.GetBytes(bytArr);
            fle.Write(bytArr,0,bytArr.Length);
            fle.Close();
         }
         label1.Text = "File Created";
      }
   }
}