textarea { /* for all text* area elements */
resize: none;
}
#foo { /* for particular id */
resize: none;
}textarea {
resize: none;
}textarea {
resize: none;
}<textarea class="myTextArea"></textarea>
<style>
.myTextArea {
resize: none;
}
</style><textarea style="resize: none;"></textarea><asp:TextBox ID="TextBox1" runat="server" TextMode = "MultiLine" style = "resize:none"></asp:TextBox>