Passing value using session ASP.Net

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session

Hi,

I am quite new with ASP.net. I have a parent page where it can call a pop-up window. At the pop-up window you can browse for folder path, and click OK button to pass it back to the parent page where the folder path is displayed in a text box. I am trying to use Session but I cannot figure out how to post it back to the parent page. Here is the code from the Page_load of the parent

protected void Page_Load(object sender, EventArgs e)
        {

            if (!IsPostBack)
            {
                'this.txtRaw.Text = ADSclass.filePath.ToString();
            }
        }

this is the code from the pop-up window

protected void _selectButton_Click(object sender, EventArgs e)
        {
          Session["path"] = this._browseTextBox.Text.ToString();
          ADSclass.filePath = this._browseTextBox.Text.ToString();//this is a public variable that I declared in a class
        }

Any help will do :)