AjaxControlToolkit.AsyncFileUpload.GenerateHtmlInputFileControl C# (CSharp) Method

        protected string GenerateHtmlInputFileControl(string lastFileName)
        {
            var div = new HtmlGenericControl("div");
            Controls.Add(div);

            if(this.UploaderStyle == AsyncFileUploaderStyle.Modern) {
                var bgImageUrl = ToolkitResourceManager.GetImageHref(AjaxControlToolkit.Constants.AsyncFileUploadImage, this);

                var style = "background:url(" + bgImageUrl + ") no-repeat 100% 1px; height:24px; margin:0px; text-align:right;";
                if(!Width.IsEmpty)
                    style += "min-width:" + Width.ToString() + ";width:" + Width.ToString() + " !important;";
                else
                    style += "width:355px;";

                div.Attributes.Add("style", style);
            }

            if(!(this.UploaderStyle == AsyncFileUploaderStyle.Modern && IsDesignMode)) {
                _inputFile = new HtmlInputFile();
                if(!this.Enabled)
                    _inputFile.Disabled = true;
                div.Controls.Add(_inputFile);
                _inputFile.Attributes.Add("id", _inputFile.Name.Replace("$", "_"));
                if(this.UploaderStyle != AsyncFileUploaderStyle.Modern) {
                    if(BackColor != Color.Empty)
                        _inputFile.Style[HtmlTextWriterStyle.BackgroundColor] = ColorTranslator.ToHtml(BackColor);

                    if(!Width.IsEmpty)
                        _inputFile.Style[HtmlTextWriterStyle.Width] = Width.ToString();
                    else
                        _inputFile.Style[HtmlTextWriterStyle.Width] = "355px";
                }
            }

            if(this.UploaderStyle == AsyncFileUploaderStyle.Modern) {
                var style = "opacity:0.0; -moz-opacity: 0.0; filter: alpha(opacity=00); font-size:14px;";
                if(!Width.IsEmpty)
                    style += "width:" + Width.ToString() + ";";

                if(_inputFile != null)
                    _inputFile.Attributes.Add("style", style);
                var textBox = new TextBox();

                if(!IsDesignMode) {
                    var div1 = new HtmlGenericControl("div");
                    div.Controls.Add(div1);
                    style = "margin-top:-23px;text-align:left;";
                    div1.Attributes.Add("style", style);
                    div1.Attributes.Add("type", "text");
                    div1.Controls.Add(textBox);
                    style = "height:17px; font-size:12px; font-family:Tahoma;";
                } else {
                    div.Controls.Add(textBox);
                    style = "height:23px; font-size:12px; font-family:Tahoma;";
                }
                if(!Width.IsEmpty && Width.ToString().IndexOf("px") > 0)
                    style += "width:" + (int.Parse(Width.ToString().Substring(0, Width.ToString().IndexOf("px"))) - 107).ToString() + "px;";
                else
                    style += "width:248px;";

                if(lastFileName != String.Empty || this._failedValidation) {
                    if((this.FileBytes != null && this.FileBytes.Length > 0) && (!this._failedValidation)) {
                        style += "background-color:#00FF00;";
                    } else {
                        this._failedValidation = false;
                        style += "background-color:#FF0000;";
                    }
                    textBox.Text = lastFileName;
                } else if(BackColor != Color.Empty) {
                    style += "background-color:" + ColorTranslator.ToHtml(BackColor) + ";";
                }
                textBox.ReadOnly = true;
                textBox.Attributes.Add("style", style);
                this._innerTBID = textBox.ClientID;
            } else if(IsDesignMode) {
                Controls.Clear();
                Controls.Add(_inputFile);
            }

            return div.ClientID;
        }