ASP.NET

System.Web.UI.HtmlControls.HtmlGenericControl PreviewFrame = null;
if (!string.IsNullOrEmpty(this.PreviewFrameID))
{
    PreviewFrame =(System.Web.UI.HtmlControls.HtmlGenericControl) this.NamingContainer.FindControl(this.PreviewFrameID);
    if (btnSubmit == null) throw new HttpException("PreviewFrameID must point to an existing control on the page.");
    PreviewFrame.Attributes.Add("name", PreviewFrame.UniqueID);
}

<iframe id="PreviewFrame" runat="server"></iframe>

What type of student are you?

" & "

[WebMethod]

    public List<string> getAdmissionNo(string prefixText)
    {

        SqlConnection sqlConnection = new SqlConnection(ConfigurationManager.AppSettings["MyCon"].ToString());
        sqlConnection.Open();

        SqlCommand sqlCommand = new SqlCommand("select Convert(varchar,AdmissionNo) As AdmissionNo from OA_ADM_tblAdmission_AdmissionDetails  where AdmissionNo like @Name+'%'", sqlConnection);
        sqlCommand.Parameters.AddWithValue("@Name", prefixText);
        SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(sqlCommand);
        DataTable dt = new DataTable();
        sqlDataAdapter.Fill(dt);
        List<string> AdmissionNos=new List<string>();


        for (int i = 0; i < dt.Rows.Count; i++)
        {

            string s =Convert.ToString(dt.Rows[i]["AdmissionNo"].ToString());

AdmissionNos.Add(s);


      }

      return AdmissionNos;

  }

<asp:ScriptManager runat="server" ID="sm"></asp:ScriptManager>
     <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                                                <ContentTemplate>
                                                    <asp:TextBox ID="txtAdmisssionNo" runat="server"  MaxLength="15"></asp:TextBox>
                                                    <asp:AutoCompleteExtender ID="autoCompleteExtender" runat="server" TargetControlID="txtAdmisssionNo"
                                                        MinimumPrefixLength="1" ServiceMethod="getAdmissionNo" ServicePath="~/Service.asmx" >
                                                    </asp:AutoCompleteExtender>
                                                </ContentTemplate>
                                            </asp:UpdatePanel>

<asp:Repeater runat="server" ID="rpt" DataSourceID="dsID">
    <ItemTemplate>
         <%#Eval("something")%>
    </ItemTemplate>
</asp:Repeater>

public string Hello()
{
     return "hello";
}

<asp:Label ID="Label1" runat="server" Text='<%#Hello() %>' />

list<string>

124828

Sample Gridview Data.
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|          | UserID         | First Name    | Last Name | Last Loggedin|    
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|imgBtn    | PHUserId1    | Jim             | Carey     | 1/16/2011 6:00AM    |
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|imgBtn    | PHUserId2    | Andres           | Boni     | 1/27/2011 5:56 PM  |
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|imgBtn    | PHUserId3    | George           | Jungle   | 1/2/2011 4:01 AM    |
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