如果页面不在pageload方法上回发，则调用Webservice

问题描述

团队，
如果页面不在pageload方法上回发，则如何调用Web服务.我正在调用Web服务以在Ajax dropdownlist上显示值.最初它运行良好，但是当我在buttonclick上添加了inesert storeprocedure时
在提交表单数据之前/之后，我收到用户/无效的回发或回调参数解决方案未处理SQL异常"的信息.

请提出建议.

Hi Team,
How to call Webservice if page is not postback on pageload method. I am calling a webservice to display values on ajax dropdownlist.Initially it was running fine but when I added inesert storeprocedure on buttonclick

I am getting ''SQL Exception was unhandled by user/Invalid postback or callback argument solution'' before /after submit form data.

Please advise.

public partial class Help8 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        
        if (!Page.IsPostBack)
        {
           
        }
    }
  protected void SubmitButton_Click (object sender, EventArgs e)
  {
      if (Page.IsValid)
      {
          String strConnString = System.Configuration.ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString;
          SqlConnection con = new SqlConnection(strConnString);
          SqlCommand cmd = new SqlCommand();
          cmd.CommandType = CommandType.StoredProcedure;
          cmd.CommandText = "InsertDonationForm";
          cmd.Parameters.Add("@fName", SqlDbType.Int).Value = TxtName.Text.Trim();
          cmd.Parameters.Add("@lName", SqlDbType.Int).Value = TxtLastName.Text.Trim();
          cmd.Parameters.Add("@dob", SqlDbType.Int).Value = Convert.ToDateTime(TxtDateofBirth.Text);
          cmd.Parameters.Add("@@email", SqlDbType.Int).Value = TxtEmail.Text.Trim();
          cmd.Parameters.Add("@gender", SqlDbType.Int).Value = RbtGender.SelectedValue.Trim();
          cmd.Parameters.Add("@continent", SqlDbType.Int).Value = ddlContinent.SelectedItem.Text;
          cmd.Parameters.Add("@country", SqlDbType.Int).Value = ddlCountry.SelectedItem.Text;
          cmd.Parameters.Add("@mNumber", SqlDbType.Int).Value = TxtMobile.Text.Trim();
          cmd.Parameters.Add("@pNumber", SqlDbType.Int).Value = TxtPhone.Text.Trim();
          cmd.Parameters.Add("@iDProof", SqlDbType.Int).Value = TxtIDProof.Text.Trim();
          cmd.Parameters.Add("@document", SqlDbType.Int).Value = TxtEmail.Text.Trim();
          cmd.Parameters.Add("@address ", SqlDbType.Int).Value = TxtAddress.Text.Trim();   
          cmd.Connection = con;
          try
          {
              con.Open();
              cmd.ExecuteNonQuery();
              insertReportLabel.Text = "Donation Form Record inserted sucessfully";
          }
          catch
          {
              insertReportLabel.Text = "Donation Form Record NOT inserted";
          }
          finally
          {
              con.Close();
              con.Dispose();
          }
      }
      else
      {
          Response.Write("hello");
      }
   }
  }

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Help8.aspx.cs" Inherits="Help8" EnableEventValidation="false" Debug="true" %>
<%@ Register TagPrefix="asp" Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit"%>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
<asp:Panel ID="Panel2" runat="server" ScrollBars="None" Width="100%" Height="2%" Wrap="true" Direction="LeftToRight" BackColor="Black">
<p style="font-weight: bold; font-style: italic; color:white;font-size:initial"><img src="Image/animated image home.gif" width="60" height="40"/>Donate Your Clothes for Noble Cause:Initiative taken by "Dolly Foundation":Ghana...<img src="Image/animated image home1.gif" width="150" height="40"/></p><br />
Please Find Online Donation below:-
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server">
<asp:Panel ID="Panel1" runat="server" ScrollBars="Auto" Width="100%" Height="70%" Wrap="true" Direction="LeftToRight" BorderStyle="Groove" ForeColor="White" Font-Bold="true">
<div style="width:49%;height:146px; removed:relative;float:left; removed 0px; removed 0px;">
<div>
        Please fill the Online Donation Form as below:-<br /><br />
<table class="style1">
<tr>
<td style="height: 22px; width: 194px">         First Name:</td>
<td style="height: 22px">
<asp:TextBox ID="TxtName" runat="server" Width="142" style="margin-left: 1px">
<br />
<br />
</td>
<td>
<asp:RequiredFieldValidator

ID="RequiredFieldValidator1"

Display="Dynamic"

runat="server" ErrorMessage="Name is required"

ControlToValidate="TxtName"

ForeColor="Red"

Text="*">

<asp:RegularExpressionValidator

Display="Dynamic"

ForeColor="Red"

ID="RegularExpressionValidator1"

runat="server"

ErrorMessage="Please enter a valid Name "

ValidationExpression="^[a-zA-Z''-'\s]{1,40}$"

ControlToValidate="TxtName"

Text="*">

</td>
</tr>
<tr>
<td style="width: 194px">         Last Name:</td>
<td>
<asp:TextBox ID="TxtLastName" Width="142" runat="server" style="margin-left: 0px">
<br />
<br />
</td>
<td>
<asp:RequiredFieldValidator

ID="RequiredFieldValidator2"

Display="Dynamic"

runat="server" ErrorMessage="LastName is required"

ControlToValidate="TxtLastName"

ForeColor="Red"

Text="*">
<asp:RegularExpressionValidator

Display="Dynamic"

ForeColor="Red"

ID="RegularExpressionValidator2"

runat="

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