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<asp:Button ID="btn" runat="server" Text="Click me" OnClick="ButtonClicked" />
<script language="javascript">
function javascriptMethod() {
alert(1);
}
</script>
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protected void ButtonClicked(object sender, EventArgs e)
{
btn.Text = "ddddddddddddddd";
}
protected void Page_Load(object sender, EventArgs e)
{
btn.Attributes.Add("onclick", "javascriptMethod();return true;");
}
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