سلام
این کد من
<form id="form1" runat="server">
<div id="DivMaster" runat="server" >
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdateProgress ID="UpdateProgress" runat="server" >
<ProgressTemplate>
<div runat="server" id="Di1" style="color:Red ">
<asp:Image ID="Image1" runat="server" ImageAlign="AbsMiddle"
ImageUrl="Img/p.gif" Style="left: 150px; position: absolute;
top: 145px; height: 29px; width: 297px;" />
</div>
</ProgressTemplate>
</asp:UpdateProgress>
<br />
<asp:TextBox ID="Txtunit" runat="server" Style="left: 142px; position: absolute;
top: 298px"></asp:TextBox>
<br />
<asp:UpdatePanel ID="Up1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div>
<asp:TextBox ID="TextBox2" runat="server" Style="left: 162px; position: absolute;
top: 110px; width: 128px;"></asp:TextBox>
<asp:Button ID="btnSubmit" runat="server" OnClick="btnSubmit_Click" Style="left: 137px;
position: absolute; top: 190px; bottom: 313px;" Text="Submit"
onload="btnSubmit_Load" />
<asp:Label ID="lblFname" runat="server" Style="left: 62px; position: absolute; top: 79px"
Text="FirstName"></asp:Label>
<asp:Label ID="lblLNmae" runat="server" Style="left: 61px; position: absolute; top: 109px; width: 71px;"
Text="Last Name"></asp:Label>
</div>
</ContentTemplate>
</asp:UpdatePanel>
<br />
<br />
<asp:Label Text="استان" runat="server"
Style="left: 37px; position: absolute; top: 144px" ></asp:Label>
<br />
<asp:DropDownList ID="Ddlunit" runat="server"
Style="left: 26px; position: absolute; top: 164px; margin-bottom: 0px;">
<asp:ListItem>تهران</asp:ListItem>
<asp:ListItem>گیلان</asp:ListItem>
<asp:ListItem>قزوین</asp:ListItem>
<asp:ListItem>لرستان</asp:ListItem>
</asp:DropDownList>
<br />
<br />
<br />
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
<Triggers >
<asp:AsyncPostBackTrigger ControlID="btnSubmit" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:Label ID="lblUnit" runat="server" Style="left: 50px; position: absolute;
top: 298px; height: 19px;" Text="Full Name"></asp:Label>
<asp:TextBox ID="TextBox3" runat="server" Style="left: 150px; position: absolute;
top: 249px; bottom: 284px;"></asp:TextBox>
<asp:TextBox ID="TextBox1" runat="server" Style="left: 160px; position: absolute;
top: 77px"></asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
</div>
<p>
<asp:Label ID="lblFullname" runat="server" Style="left: 54px; position: absolute;
top: 257px" Text="Full Name"></asp:Label>
</p>
</form>
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protected void btnSubmit_Click(object sender, EventArgs e)
{
DivMaster.Disabled = true;
System.Threading.Thread.Sleep(15000);
TextBox1.Text=TextBox1.Text.Trim();
TextBox2.Text=TextBox2.Text.Trim();
Txtunit.Text = Ddlunit.Text;
TextBox3.Text = TextBox1.Text.Trim() + " " + TextBox2.Text.Trim();
}