Dynamically add TextBox on ASP.Net Button Click using C# and VB.Net

Hi ramco11917,

Note:- For this sample i have refer below article. For more details refer below article link.

https://www.aspsnippets.com/Articles/Get-Value-Text-of-dynamically-created-TextBox-in-ASPNet-using-C-and-VBNet.aspx

Please refer below sample.

HTML

<asp:Button ID="btnAdd" runat="server" Text="+" OnClick="btnAdd_Click" />
<hr />
<asp:Panel ID="pnltxtBoxes" runat="server">
</asp:Panel>

Code

C#

protected void Page_PreInit(object sender, EventArgs e)
{
    List<string> keys = Request.Form.AllKeys.Where(key => key.Contains("txtDynamic")).ToList();
    int i = 1;
    foreach (string key in keys)
    {
        this.CreateTextBox("txtDynamic" + i);
        i++;
    }
}

protected void btnAdd_Click(object sender, EventArgs e)
{
    int index = pnltxtBoxes.Controls.OfType<TextBox>().ToList().Count + 1;
    this.CreateTextBox("txtDynamic" + index);
}

private void CreateTextBox(string id)
{
    TextBox txt = new TextBox();
    txt.ID = id;
    pnltxtBoxes.Controls.Add(txt);

    Literal lt = new Literal();
    lt.Text = "<br />";
    pnltxtBoxes.Controls.Add(lt);
}

VB.Net

Protected Sub Page_PreInit(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Init
    Dim keys As List(Of String) = Request.Form.AllKeys.Where(Function(key) key.Contains("txtDynamic")).ToList()
    Dim i As Integer = 1

    For Each key As String In keys
        Me.CreateTextBox("txtDynamic" & i)
        i += 1
    Next
End Sub

Protected Sub btnAdd_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim index As Integer = pnltxtBoxes.Controls.OfType(Of TextBox)().ToList().Count + 1
    Me.CreateTextBox("txtDynamic" & index)
End Sub

Private Sub CreateTextBox(ByVal id As String)
    Dim txt As TextBox = New TextBox()
    txt.ID = id
    pnltxtBoxes.Controls.Add(txt)
    Dim lt As Literal = New Literal()
    lt.Text = "<br />"
    pnltxtBoxes.Controls.Add(lt)
End Sub

Screenshot