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<asp:TextBox runat="server" onMouseOver="this.focus();this.select()">dsdsds</asp:TextBox>
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<asp:TextBox runat="server" onMouseOver="this.focus()" onFocus="this.select()">dsdsds</asp:TextBox>
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this.txtbox1.Attributes.Add("onMouseOver", "this.focus();this.select();");

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textbox1.Focus();
textbox1.Attributes.Add("onfocus","this.select()");