Create Dynamic Textbox and Get values

Question

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.

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.

Community · Accepted Answer · 2017-05-23 12:05:28Z

1

I have already answered it here.

Lost dynamically created text box values

You can try this.

private string GetValue(string ControlID)
{
   string[] keys = Request.Form.AllKeys;
   string value = string.Empty;
   foreach (string key in keys)
   {
     if (key.IndexOf(ControlID) >= 0)
     {
         value = Request.Form[key].ToString();
         break;
     }
   }

   return value;
}

Then to get the value

string txtChoice1value = GetValue("txtChoice1");

edited May 23, 2017 at 12:05

CommunityBot

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answered Jul 9, 2013 at 5:41

Debajit Mukhopadhyay

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Comments

Erfan · Accepted Answer · 2013-07-09 05:09:12Z

0

First of all when you dynamically create a control it doesn't need to be set "runat = sever". Problem is in this line `ContentPlaceHolder content_new = new ContentPlaceHolder();` you make a new ContentPlaceHolder, this mean it doesn't have any control to be found.

Check this page. How To Create TextBox Control Dynamically at Runtime

edited Jul 9, 2013 at 5:09

answered Dec 24, 2012 at 11:56

Erfan

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Comments

user2552779 · Accepted Answer · 2013-07-09 05:28:32Z

0

You need to find the reference of your already created ContentPlaceHolder like-

ContentPlaceHolder cnt =(ContentPlaceHolder)this.Master.FindControl("ContentPlaceHolder1");

and then add the dynamically created Control in that ContentPlaceHolder as-

cnt.Controls.Add(Session["Panel"] as Panel);

Why you creating a new ContentPlaceHolder each time even when you have mentioned that you are using masterPage, so there must exists a ContentPlaceHolder..

answered Jul 9, 2013 at 5:28

user2552779

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Comments

Vinay Pandey · Accepted Answer · 2013-07-09 05:35:36Z

0

Controls wont persist on postback have a look at http://www.denisbauer.com/ASPNETControls/DynamicControlsPlaceholder.aspx

answered Jul 9, 2013 at 5:35

Vinay Pandey

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