Dynamically programmatically add contols at run time Asp.Net

Introduction:

In my previous article I have explained about What is View State? How to Store and retrieve values from View State. In this article I am going to explain how to add controls programmatically on run time.

Explanation:

This example adds a text box and button to a Web Forms page at run time. It also dynamically binds an event handler to the button's Click event. The handler displays the values of the dynamically generated text box.

The controls are added into a Panel Web server control, which acts as a placeholder. The controls are separated in the panel with line breaks (HTML <BR> elements), which are added to the panel using the LiteralControl control.

Below is the code. 

private void Page_Load(object sender, System.EventArgs e)

{

    if (!IsPostBack)

        AddControls();

}

protected override void LoadViewState(object savedState)

{

    base.LoadViewState(savedState);

    if (ViewState["controsladded"] == null)

        AddControls();

}

private void AddControls()

{

    TextBox dynamictextbox = new TextBox();

    dynamictextbox.Text = "sample text";

    dynamictextbox.ID = "txtdynamic";

    Button dynamicbutton = new Button();

    dynamicbutton.Click += new System.EventHandler(btndynamic_Click);

    dynamicbutton.Text = "Dynamic Button";

    Panel1.Controls.Add(dynamictextbox);

    Panel1.Controls.Add(new LiteralControl("<BR>"));

    Panel1.Controls.Add(new LiteralControl("<BR>"));

    Panel1.Controls.Add(dynamicbutton);

    ViewState["controlsadded"] = true;

}

private void btndynamic_Click(Object sender, System.EventArgs e)

{

    TextBox tb = new TextBox();

    tb = (TextBox)(Panel1.FindControl("txtdynamic"));

    Label1.Text = tb.Text;

}

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