Retrive data from dynamically created table

[semomaniz]

I have created two tables dynamically and have added textboxes inside the table. now i am trying to retrieve the data from the the textboxes and i am getting a null reference error. I am not sure why i am getting this error. Please advice.

Code to set the tables

 
 protected void LoadCityStateControl(int origin, int destination)
    {
        //initializing the origin city/state controls
        Table city = new Table();
        city.ID = "tblcity";
        city.BorderStyle = BorderStyle.Solid;
        city.BorderWidth = 1;
 
 
        for (int i = 0; i < origin; i++)
        {
            TableRow tr = new TableRow();
            TableCell tc = new TableCell();
            tc.ID = "tc" + (i + 1);
            Label mx = new Label();
            mx.Text = "Origin City/State #" + (i + 1) + " : ";
            mx.ID = "lblorgcitystate" + (i + 1);
 
            TextBox tx = new TextBox();
            tx.ID = "txtOrgCityState" + (i + 1);
 
            Label mn = new Label();
            mn.ID = "lbltest" + (i + 1);
            mn.Text = "  (eg: Cape Girardeau,MO )";
 
            tc.Controls.Add(mx);
            tc.Controls.Add(tx);
            tc.Controls.Add(mn);
            tr.Cells.Add(tc);
            city.Rows.Add(tr);
        }
        cpanel.Controls.Add(city);
 
        //initializing the destination city/state controls
        Table descity = new Table();
        descity.ID = "tbldescity";
        descity.BorderStyle = BorderStyle.Solid;
        descity.BorderWidth = 1;
 
        for (int i = 0; i < destination; i++)
        {
            TableRow trd = new TableRow();
            TableCell tcd = new TableCell();
            tcd.ID = "tcd" + (i + 1);
            Label mxd = new Label();
            mxd.Text = "Destination City/State #" + (i + 1) + " : ";
            mxd.ID = "lbldestcitystate" + (i + 1);
 
            TextBox txd = new TextBox();
            txd.ID = "txtDestCityState" + (i + 1);
 
            Label mnd = new Label();
            mnd.ID = "lbldtest" + (i + 1);
            mnd.Text = "  (eg: Dallas,TX )";
 
            tcd.Controls.Add(mxd);
            tcd.Controls.Add(txd);
            tcd.Controls.Add(mnd);
            trd.Cells.Add(tcd);
            descity.Rows.Add(trd);
        }
        cpanel.Controls.Add(descity);
 
 
    }
 

Here is the code to retrieve data

        int orgcounter = Int32.Parse(txtNumPicks.Text);
        int descounter = Int32.Parse(txtNumDrops.Text);
 
        for (int i = 0; i <= orgcounter; i++)
        {
            foreach (Control c in cpanel.Controls)
            {
                 Table m = (Table)c.FindControl("tbldescity");
                foreach (TableRow r in m.Rows)
                 {
                    foreach (TableCell tc in r.Cells)
                   {
                       orgcity = ((TextBox)tc.FindControl("txtOrgCityState" +  (i).ToString())).Text;
                   }
 
                }
            }
       }
 
 

I just noticed that if i try to get the controls count inside the panel i get a value zero. Why is this happening.

 lblerr.Text = c.Controls.Count.ToString();
 

Please help . Thank you in advance

[Plater]

When you insert/name your controls you use i+1, when you search, you are using just i, so sometimes the FindControl will return a null value since it cannot find the control

[semomaniz]

I did put I+1 while searching and still i am getting the same error. I noticed that the reason why i was getting this error was i didnt set the form at page load event. The form is based on input that i get from another form. In other words i determine the count of pick and drop from a form which gets hidden after value is submitted. then the dynamically created form is displayed. If i recreate the form inside the click event of previous form submit button i still am not able to get the value from textboxes.

To avoid this i am trying to redirect the page to the same page and have the form created dynamically in the page load event. But i am still not able to retrieve data.