Create a web application in c#

Drag a button, five labels and one textbox on the form

Then write code on form load event

C#

protected void Page_Load(object sender, EventArgs e)

    {

        Label1.Text = "Initial text of lable1";

        Label2.Text = "Initial text of lable2";

        Label3.Text = "Initial text of lable3";

        Label4.Text = "Initial text of lable4";

        Label5.Text = "Initial text of lable5";

        TextBox1.Text = "Label1";

    }

VB

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

        Label1.Text = "Initial text of lable1"

        Label2.Text = "Initial text of lable2"

        Label3.Text = "Initial text of lable3"

        Label4.Text = "Initial text of lable4"

        Label5.Text = "Initial text of lable5"

        TextBox1.Text = "Label1"

    End Sub

After that write some code on button click even

C#

protected void Button1_Click(object sender, EventArgs e)

    {

        Label lbl;

        lbl = (System.Web.UI.WebControls.Label )FindControl(TextBox1.Text);

        lbl.Text = "Text Changed to www.smspunch.com";

    }

VB

  Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)

        Dim lbl As Label

        lbl = DirectCast(FindControl(TextBox1.Text), System.Web.UI.WebControls.Label)

        lbl.Text = "Text Changed to www.smspunch.com"

    End Sub

This is simple code to find control dynamically.