Question

I’m using PostBackUrl to post my control from a “firstwebpage.aspx” to a “secondwebpage.aspx” so that I would be able to generate some configuration files.

I do understand that I can make use of PreviousPage.FindControl(“myControlId”) method in my secondwebpage.aspx to get my control from “firstwebpage.aspx”and hence grab my data and it worked.

However, it seems that this method does not work on controls which I generated programmically during runtime while populating them in a table in my firstwebpage.aspx.

I also tried using this function Response.Write(“–” + Request[“TextBox1”].ToString() + “–“);
And although this statement do printout the text in the textfield on TextBox1, it only return me the string value of textbox1. I am unable to cast it to a textbox control in the following format too

TextBox temptextBox = (TextBox)Request[“TextBox1”];

My question is, how can I actually access the control which i generated programmically in “firstwebpage.aspx” on “secondwebpage.aspx”?

Please advice!
thanks alot!

//my panel and button in aspx

<asp:Panel ID="Panel2" runat="server"></asp:Panel>

<asp:Button ID="Button1" runat="server" Text="Generate Xml" PostBackUrl="~/WebForm2.aspx" onclick="Button1_Click" />

//this is my function to insert a line into the panel

 public void createfilerow(string b, string path, bool x86check, bool x86enable, bool x64check, bool x64enable)
        {
            Label blank4 = new Label();
            blank4.ID = "blank4";
            blank4.Text = "";
            Panel2.Controls.Add(blank4);

            CheckBox c = new CheckBox();
            c.Text = b.Replace(path, "");
            c.Checked = true;
            c.ID = "1a";
            Panel2.Controls.Add(c);

            CheckBox d = new CheckBox();
            d.Checked = x86check;
            d.Enabled = x86enable;
            d.ID = "1b";
            Panel2.Controls.Add(d);

            CheckBox e = new CheckBox();            
            e.Checked = x64check;
            e.Enabled = x64enable;
            e.ID = "1c";
            Panel2.Controls.Add(e);
    }

//my virtual path in WebForm2.aspx

<%@ PreviousPageType VirtualPath="~/WebForm1.aspx"  %>

//my pageload handler

protected void Page_Load(object sender, EventArgs e)
{  
    if (PreviousPage != null)
    {
        CheckBox tempCheckbox = (CheckBox)Page.PreviousPage.FindControl("1a");
        Button1.Text = tempCheckbox.Text;
    }         
}

//handler which will populate the panel upon clicking

protected void Button7_Click(object sender, EventArgs e)
        {
            //get foldername 

            if (!Directory.Exists(@"myfilepath" + TextBox2.Text))
            {
                //folder does not exist
                //do required actions
                return;
            }
            string[] x86files = null;
            string[] x64files = null;
            string[] x86filespath = null;
            string[] x64filespath = null;
            ArrayList common = new ArrayList();
            if (Directory.Exists(@"myfilepath" + TextBox2.Text + "\\x86"))
                x86files = Directory.GetFileSystemEntries("myfilepath" + TextBox2.Text + "\\x86");
            if (Directory.Exists(@"myfilepath" + TextBox2.Text + "\\x64"))
                x64files = Directory.GetFileSystemEntries("myfilepath" + TextBox2.Text + "\\x64");

            //some codes to convert x64files and x86files to string[]

            //The header for Panel, 4 column
            Label FL = new Label();
            FL.ID = "flavourid";
            FL.Text = "Flavour";
            Panel2.Controls.Add(FL);

            Label filetext = new Label();
            filetext.ID = "filenamelabel";
            filetext.Text = "File(s)";
            Panel2.Controls.Add(filetext);

            Label label86 = new Label();
            label86.ID = "label86";
            label86.Text = "x86";
            Panel2.Controls.Add(label86);

            Label label64 = new Label();
            label64.ID = "label64";
            label64.Text = "x64";
            Panel2.Controls.Add(label64);


            //a for loop determine number of times codes have to be run
            for (int a = 0; a < num; a++)
            {
                ArrayList location = new ArrayList();
                if (//this iteration had to be run)
                {
                    string path = null;
                    switch (//id of this iteration)
                    {
                     case id:
                     path = some network address
                    }

                    //check the current version of iternation
                    string version = //version type;
                    //get the platform of the version
                    string platform = //platform

                    if (curent version = certain type)
                    {   
                        //do what is required.
                        //build a list
                    }
                    else
                    {
                        //normal routine
                        //do what is required
                        //build a list
                    }

                    //populating the panel with data from list

                        createflavourheader(a);
                        //create dynamic checkboxes according to the list

                     foreach(string s in list)
                     //createrow parameter is by version type and platform
                             createfilerow(readin, path, true, true, false, false);

                    }
                }
            }
            form1.Controls.Add(Panel2);
        }    

Sorry can’t show you the full code as it is long and I believe it should be confidential even though i wrote them all

Answer 1

Yes you can access, Below is an example

 // On Page1.aspx I have a button for postback
  <asp:Button ID="btnSubmit" runat="server" Text="Submit" 
     PostBackUrl="~/Page2.aspx" />

 // Page1.aspx.cs 
 protected void Page_Load(object sender, EventArgs e)
 {
    TextBox t = new TextBox(); // created a TextBox
    t.ID = "myTextBox";        // assigned an ID
    form1.Controls.Add(t);     // Add to form

}

Now on the second page I will get the value of TextBox as

 // Page2.aspx.cs
 protected void Page_Load(object sender, EventArgs e)
 {       
    if (PreviousPage != null)
    {
        TextBox t = (TextBox) PreviousPage.FindControl("myTextBox");
        string mytboxvalue = t.Text;
    }
                        // OR
    string myTextBoxValue = Request.Form["myTextBox"];
 }

Updated Answer:

  Panel myPanel = new Panel();
    myPanel.ID = "myPanel";

    TextBox t = new TextBox();
    t.ID = "myTextBox";
    myPanel.Controls.Add(t);

    TextBox t1 = new TextBox();
    t1.ID = "myTextBox1";
    myPanel.Controls.Add(t1);

    // Add all your child controls to your panel and at the end add your panel to your form
    form1.Controls.Add(myPanel);

   // on the processing page you can get the values as
  protected void Page_Load(object sender, EventArgs e)
  {

    if (PreviousPage != null)
    {
        TextBox t = (TextBox) PreviousPage.FindControl("myTextBox");
        string mytboxvalue = t.Text;
    }

    string myTextBoxValue = Request.Form["myTextBox1"];
  }