Create Dynamic Textboxex and Get values

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Hello,

I want to create dynamic text box when user click on Add more link button.
For this I am using this code. And I have to mention that I am using master page.

protected void lnkAddMore_Click(object sender, EventArgs e)
{
if (Request.Cookies["value"] != null)
{
i = Convert.ToInt32(Request.Cookies["value"].Value) + 1 ;
}
for (int k = 1; k <= i; k++)
{
LiteralControl literal = new LiteralControl();
literal.Text = "<br /><br />";
Label newLabel = new Label();
newLabel.Text = "Choice" + " " + k.ToString();
newLabel.ID = "lblChoice_" + k.ToString();
newLabel.Attributes.Add("runat", "Server");
this.panelLabel.Controls.Add(newLabel);
this.panelLabel.Controls.Add(literal);

LiteralControl literal1 = new LiteralControl();
literal1.Text = "<br /><br />";
TextBox nexText = new TextBox();
nexText.ID = "txtChoice_" + k.ToString();
nexText.Attributes.Add("TextMode", "MultiLine");
nexText.Attributes.Add("runat", "Server");
panelTextbox.Controls.Add(nexText);
this.panelTextbox.Controls.Add(literal1);

Response.Cookies["value"].Value = i.ToString();
Session["Panel"] = panelTextbox;
}
}

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (Session["Panel"] != null)
{
ContentPlaceHolder content=new ContentPlaceHolder();
content.Controls.Add(Session["Panel"] as Panel);
}
}
}

Now I am facing trouble how to retrieve the data of the these text boxes after the clicking on the submit button so that I can store the values of there text boxes to database.

What will be code written for the click event of btnSave
protected void btnSave_Click(object sender, EventArgs e)
{
if (Session["Panel"] != null)
{
ContentPlaceHolder content_new = new ContentPlaceHolder();
for (int i = 1; i <= count; i++)
{
strControlName = "txtChoice_" + i.ToString();

TextBox objTextBox = (TextBox)content_new.FindControl(strControlName);

strTextBoxValues[i] = objTextBox.Text;
string str3 = strTextBoxValues[2];
}
}
}

This code is showing error for objTextBox
The error is NullReferenceException

And How to write stored procedure for saving data of above code.

The main problem is handling the parameter declaration

how to declare dynamic parameter for passing values so that value is saved for dynamic textbox

Thanks in advance

Deepak Pandey

Posted 21-Sep-11 10:11am

aryan2010

Updated 5-Oct-11 20:15pm

v9

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André Kraak 5-Oct-11 2:40am

Edited question:
Added pre tags
Spelling/Grammar

4 solutions

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Sunasara Imdadhusen · Answer 1 · 2011-10-04T21:56:00

Use following:

C#

protected void btnSave_Click(object sender, EventArgs e)
           {
               foreach( Control c in panelTextbox.Controls )
               {
                    if(c is TextBox)
                    {
                       // Write code for saving data in Database.
                    }
               }
           }

fjdiewornncalwe · Answer 2 · 2011-09-21T10:17:00

Solution 1

After your postback, you need to use the Page.FindControl Method to find them.
Page.FindControl Method (String)[^]

Note: The Control.FindControl Method would narrow it down if you want to use panelTextbox as a base. Probably a little more efficient.

Posted 21-Sep-11 10:17am

fjdiewornncalwe

Updated 21-Sep-11 10:18am

v2

Comments

aryan2010 21-Sep-11 16:19pm

I am already tried this but it showing error

aryan2010 21-Sep-11 16:19pm

can you provide complete code for this

Joe Doc Sr · Answer 3 · 2011-09-21T10:22:00

When adding dynamic controls you have to add them again on the postback and then retireve the data from them. You will need to know how many text boxes or controls you have added and add them all again if you plan to get data out of any of them. Again every post back you must add the controls that you dynamically added before referencig them on your postback.

Try this link for some help
http://support.microsoft.com/kb/317515[^]

Piyush Dixit · Answer 4 · 2011-10-04T18:57:00

Solution 3

one solution can be :
1. save the whole panel (in which dynamic controls are added) in a session variable like :

C#

session["Panel"] = "YourPanel";

2. restore it on the postback event :

C#

if(PostBack)
{
   if(session["Panel"]!=null)
      Form1.Controls.Add(Session["Panel"] as Panel);
}

Posted 4-Oct-11 18:57pm

Piyush Dixit

Updated 4-Oct-11 21:58pm

v2

Create Dynamic Textboxex and Get values

4 solutions

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