ASP.NET

<rewrite>
            <rules>
                <rule name="http to https" stopProcessing="true">
                    <match url="(.*)" />
                    <conditions>
                        <add input="{HTTPS}" pattern="^off$" />
                    </conditions>
                    <action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" redirectType="Found" />
                </rule>
            </rules>
        </rewrite>

<appSettings>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
  </appSettings>

<Triggers>
                <asp:PostBackTrigger ControlID="SaveBtn" />
            </Triggers>

EnableEventValidation="false" 

Sys.WebForms.PageRequestManagerParserErrorException: 

<script src="../js/jquery-ui.js"></script>
  <link href="../js/jquery-ui.css" rel="stylesheet" />

<input id="txtsearch" type="text" />

$('#txtsearch').autocomplete({
          source: '~/CategoryHandler.ashx'
      });

public void ProcessRequest(HttpContext context)
    {
        string name = context.Request["Name"] ?? "";
        List<string> ls = new List<string>();

        try
        {
            if (con.State == ConnectionState.Closed)
            {
                con.Open();
            }
            SqlCommand cmd = new SqlCommand("CategoryPro", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@action", "ShowCategoryName");
            cmd.Parameters.AddWithValue("@serchname", name);
            cmd.Parameters.Add("@msg", SqlDbType.VarChar, 500);
            cmd.Parameters["@msg"].Direction = ParameterDirection.Output;

            SqlDataReader dr = cmd.ExecuteReader();

            while (dr.Read())
            {
                ls.Add(dr["Name"].ToString());

            }

        }
        catch (Exception ex)
        {
            throw ex;

        }

        finally
        {
            con.Close();
        }
        JavaScriptSerializer js = new JavaScriptSerializer();
        context.Response.Write(js.Serialize(ls));
    }

<asp:Label ID="lblPurchOnwer" Text='<%#Eval("buyername") %>' Style="width: 450px;
                                                                        color: #0093B2; font-weight: bold;" runat="server"></asp:Label>

C#
  var Buyernames = Eval("buyername");
  var bFName = Buyernames.Substring(0, Buyernames.IndexOf(" "));
  var bLName = Buyernames.Substring(Buyernames.IndexOf(" ") + 1);