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  4. Triggering an event when a TextBox change occurs (C#)
<%@ Page Language="C#" %>

    protected void TextBox1_TextChanged(object sender, EventArgs e)
    {
        Response.Write("OnTextChanged event triggered");
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Write("OnClick event triggered");
    }



    OnTextChanged Page


    
    

                             Runat="server" 
                     AutoPostBack="True" 
                     OnTextChanged="TextBox1_TextChanged"/>
                     
                            Runat="server" 
                    Text="Button" 
                    OnClick="Button1_Click" />