Create dynamic Panel control with responsive class using C# and VB.Net in ASP.Net

Hi IamAzhar,

Refer below sample.

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    Panel pnl = new Panel();
    pnl.ID = "pnl1";
    pnl.CssClass = "panel panel-default";
    for (int i = 0; i < 3; i++)
    {
        TextBox txt = new TextBox();
        txt.ID = "a";
        txt.CssClass = "form-control";
        pnl.Controls.Add(txt);
        Literal lt = new Literal();
        lt.Text = "<br/>";
        pnl.Controls.Add(lt);
    }
    form1.Controls.Add(pnl);
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim pnl As Panel = New Panel()
    pnl.ID = "pnl1"
    pnl.CssClass = "panel panel-default"
    For i As Integer = 0 To 3 - 1
        Dim txt As TextBox = New TextBox()
        txt.ID = "a"
        txt.CssClass = "form-control"
        pnl.Controls.Add(txt)
        Dim lt As Literal = New Literal()
        lt.Text = "<br/>"
        pnl.Controls.Add(lt)
    Next
    form1.Controls.Add(pnl)
End Sub

Screenshot