i want to get the location of the selected folder and tried this code, it doesn't give me any errors but it doesnt work

protected void BtnBrowse_Click(object sender, EventArgs e)
        {
            //====== Create folder dialog box object
            FolderBrowserDialog objFolderDialog = new FolderBrowserDialog();
            //===== Pass object as Parameter and get Selected network folder
            TextBox1.Text  = GetNetworkFolders(objFolderDialog);
        }

        public static string GetNetworkFolders(FolderBrowserDialog FolderBrowserDialog)
        {
            //======= Get type of Folder Dialog bog
            Type type = FolderBrowserDialog.GetType();
            //======== Get Fieldinfo for rootfolder.
            System.Reflection.FieldInfo fieldInfo = type.GetField("rootFolder", BindingFlags.NonPublic | BindingFlags.Instance);
            //========= Now set the value for Folder Dialog using DirectCast
            //=== 18 = Network Neighborhood is the root
            fieldInfo.SetValue(FolderBrowserDialog, (Environment.SpecialFolder)18);
            //==== if user click on Ok, then it will return the selected folder.
            //===== otherwise return the blank string.
            if (FolderBrowserDialog.ShowDialog() == DialogResult.OK)
            {
                return FolderBrowserDialog.SelectedPath;
            }
            else
            {
                return "";
            }
        }