How To Upload PDF IN Sql Server

protected void grvDisplayPdf_SelectedIndexChanged(object sender, EventArgs e)  
{  
    string sPathToSaveFileTo = @"C:\SelectedFile.pdf";  // on this path i will create selected PDF File Data    open pdf for checking  
    //Read Connection from web config  
    using (SqlConnection cn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["Connection"].ToString()))  
    {  
        cn.Open();  
        using (SqlCommand cmd = new SqlCommand("select PDFData from tblpdfdata where ID='" + grvDisplayPdf.SelectedValue + "' ", cn))  
        {  
            using (SqlDataReader dr = cmd.ExecuteReader(System.Data.CommandBehavior.Default))  
            {  
                if (dr.Read())  
                {  
                    // read in using GetValue and cast to byte array  
                    byte[] fileData = (byte[])dr.GetValue(0);  
                    // write bytes to disk as file  
                    using (System.IO.FileStream fs = new System.IO.FileStream(sPathToSaveFileTo, System.IO.FileMode.Create, System.IO.FileAccess.ReadWrite))  
                    {  
                        // use a binary writer to write the bytes to disk  
                        using (System.IO.BinaryWriter bw = new System.IO.BinaryWriter(fs))  
                        {  
                            bw.Write(fileData);  
                            bw.Close();  
                        }  
                    }  
                }  
                // close reader to database  
                dr.Close();  
            }  
        }  
    }  
} 

protected void btnSavePdf_Click(object sender, EventArgs e)  
{  
    using (SqlConnection cn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["Connection"].ToString()))  
    {  
        cn.Open();  
        //Convert pdf in Binary formate  
        int lenght = FileUpload1.PostedFile.ContentLength;  
        byte[] data = new byte[lenght];  
        FileUpload1.PostedFile.InputStream.Read(data, 0, lenght);  
        using (SqlCommand cmd = new SqlCommand("insert into tblPdfData " + "(PdfData) values(@data)", cn))  
        {  
            cmd.Parameters.Add("@data", data);  
            cmd.ExecuteNonQuery();  
            Response.Write("Pdf File Save in Dab");  
        }      
    }  
 }