How do I get values that entered from dynamically created textbox?

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I have created a function to get the value from user in a drop down and based on the number I should create few text boxes.

I have did created dynamic textboxes in a for loop by creating a panel in aspx page.

Now how can i get the values that entered in the text boxes?

I have tried the below code but that doesn't works..

// code to create dynamic text boxes

public void users(int cnt)
{

for (int i = 1; i <= cnt; i++)
{
TextBox txtuserAlias = new TextBox();
txtuserAlias.Text = "";
txtuserAlias.ID = "txtUserAlias" + i;
pnldisplayform.Controls.Add(txtuserAlias);
}
}

//code to call the value that entered in the text box
public void adduser()
{
int cnt1 = Int32.Parse(DropDownNoOfUsers.SelectedValue.ToString());
for (int i = 1; i <= cnt1; i++)
{
TextBox txtuserAlias = new TextBox();
txtuserAlias.ID = "txtUserAlias" + i;
some method = txtuserAlias.Text;
}
}

Could you please help with the same.
Thanks in advance.

Posted 10-Jun-15 3:39am

Malvin687

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hypermellow · Answer 1 · 2015-06-10T04:08:00

Solution 1

Hi,

If you adding your TextBoxes to pnldisplayform, then you should be able to find them again using the pnldisplayform.FindControl[^] method.

Something like this should get you started.

C#

for (int i = 1; i <= cnt1; i++)
{
  //Find TextBox in Panel Container ... 
  TextBox txtuserAlias = (TextBox)pnldisplayform.FindControl("txtUserAlias" + i);
  //Check we have found a TextBox ... 
  if (txtuserAlias != null)
  {
    someMethod(txtuserAlias.Text);
  }
  //Clear control reference for next iteration ...
  txtuserAlias=null; 
}

... hope it helps.

Posted 10-Jun-15 4:08am

hypermellow

Comments

Malvin687 10-Jun-15 10:33am

Hi thanks for your quick response.
I tried that but the value seems passing as null and the code terminates after the if statement.

hypermellow 10-Jun-15 10:42am

You need to find out if your controls (still) exists in your panel.
.. if you enable tracing, and run something like this, then you'll be closer to finding out where the problem exists.

//Write a trace message containing the ID of each TextBox found in pnldisplayform ...
foreach (Control ctl in pnldisplayform.Controls)
{
if (ctl is TextBox)
{
Trace.Write((TextBox)ctl).ID);
}
}

Mohamed El khames Bakir 10-Jun-15 10:40am

if you are trying to read values after a postback so propably your textBoxes are already disposed as they are dynamically created ,so you have to stock value before the postback itself.

Mohamed El khames Bakir · Answer 2 · 2015-06-10T05:00:00

try this code may be it will help u :

View:

XML

<asp:DropDownList ID="DropDownNoOfUsers" runat="server" AutoPostBack="True">
       <asp:ListItem>1</asp:ListItem>
       <asp:ListItem>2</asp:ListItem>
       <asp:ListItem>3</asp:ListItem>
       <asp:ListItem>4</asp:ListItem>
       <asp:ListItem>5</asp:ListItem>
   </asp:DropDownList>
   <br />
   <asp:Panel ID="pnldisplayform" runat="server">
   </asp:Panel>
   <asp:Button runat="server" ID="Btn_Value" OnClick="Btn_Value_Click" Text="GetValue"/>

   <br />
   <asp:ListBox ID="ListUser" runat="server" Width="200"></asp:ListBox>

Code Behind :

C#

private List<string> _users;
 protected void Page_Load(object sender, EventArgs e)
 {
     var cnt = Int32.Parse(DropDownNoOfUsers.SelectedValue);
     Users(cnt);
 }
 public void Users(int cnt)
 {

     for (var i = 1; i <= cnt; i++)
     {
         var txtuserAlias = new TextBox { Text = "", ID = "txtUserAlias" + i };
         txtuserAlias.Attributes.Add("runat", "Server");
         txtuserAlias.EnableViewState = true;
         pnldisplayform.Controls.Add(txtuserAlias);
     }
 }
 public List<string> GetUsers()
 {
     return pnldisplayform.Controls.OfType<TextBox>().Select(box => box.Text).ToList();
 }


 protected void Btn_Value_Click(object sender, EventArgs e)
 {
     _users = GetUsers();
     foreach (var user in _users)
     {
         ListUser.Items.Add(user);
     }

 }