Split upload textfile based on size in asp.net?

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C#

ASP.NET

File-Upload

How to split uploaded text file based on the file size???

I can split based on the dot poisition(.)...but i need to split based on the size..
i tried below coding for split....

textt = Session["filepath"].ToString();
       // conn.Open();
        string path = textt;
        int i = 0;
        foreach (string line in File.ReadAllLines(textt))
        {
            string[] parts = line.Split('.');
            foreach (string part in parts)
            {
                string Text = Encrypt(part);
                TextBox1.Text = Text;
                SqlCommand cmd = new SqlCommand("Insert into split values('" + Session["count"].ToString() + "','" +TextBox1.Text +"')",conn);
                int iCount = cmd.ExecuteNonQuery();

               // conn.Close();
               Response.Write(part);


            }
            i++; // For demo only
        }