this.TextBox1.Attributes.Add("OnKeyPress","<script>if keycode==13 keycode=9; return false;</script>");
2.
<input type='text' onkeydown="if (event.keyCode ==13) event.keyCode =9;">
this.TextBox1.Attributes.Add("OnKeyPress","<script>if keycode==13 keycode=9; return false;</script>");
2.
<input type='text' onkeydown="if (event.keyCode ==13) event.keyCode =9;">
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