yes,

because asp:button is rendered to submit button and there was no onclick attribute

<input type="submit" name="Button" value="Button" id="Button" />

so after that I added an onclick attribute to my asp:button

Button.Attributes.Add("onclick","__doPostBack('But ton','')");

so it would be rendered

<input type="submit" name="Button" value="Button" id="Button" onclick="__doPostBack('Button','')" style="height:0px;width:0px;"/>

I worked with button click event instead of text changed event.

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Mehdi.
software student.