An object reference is required for the non-static field

Karthi Keyan

9y4.3kVisual Basic .NET

Hi,

public void load()

{

WebBrowser.Navigate("some site login Page");

_Processing = true;

var username = ConfigurationManager.AppSettings["username"];

var password = ConfigurationManager.AppSettings["password"];

while (_Processing)

{

Application.DoEvents();

if (WebBrowser.ReadyState == WebBrowserReadyState.Complete || WebBrowser.ReadyState == WebBrowserReadyState.Interactive)

{

var htmlDocument = this.WebBrowser.Document;

if (htmlDocument != null)

{

foreach (HtmlElement tag in htmlDocument.GetElementsByTagName("input"))

{

switch (tag.Name)

{

case "username":

tag.InnerText = username;

break;

case "password":

tag.InnerText = password;

break;

case "cmdlogin":

tag.RaiseEvent("onclick");

tag.InvokeMember("Click");

break;

}

_Processing = false;

}

the Yellow Marked Line's show's the error.

An object reference is required for the non-static field, method, or property 'WebBrowser.Navigate(string)'

I can't understand what happend in the function. can any one help me to solve this issue.

Thanks In Advance.

5 Replies

Know the answer? Post it — somebody with the same question will find it here.

Amit Gupta9y ago
Accepted answer
All the functions you are using were not static, they are non-static methods and variables of WebBrowser class. YOU ARE USING DIRECTLY BY CALLING THE WEBBROWSER CLASS.

Declare a variable and then use like this and rename the variable name respectively.
WebBrowser webBrowser=new WebBrowser();
public  void load()
        {
            webBrowser.Navigate("some site login Page");
            var _Processing = true;
            var username = ConfigurationManager.AppSettings["username"];
            var password = ConfigurationManager.AppSettings["password"];
            while (_Processing)
            {
                Application.DoEvents();
                if (webBrowser.ReadyState == WebBrowserReadyState.Complete || webBrowser.ReadyState == WebBrowserReadyState.Interactive)
                {
                    var htmlDocument = this.webBrowser.Document;
                    if (htmlDocument != null)
                    {
                        foreach (HtmlElement tag in htmlDocument.GetElementsByTagName("input"))
                        {
                            switch (tag.Name)
                            {
                                case "username":
                                    tag.InnerText = username;
                                    break;
                                case "password":
                                    tag.InnerText = password;
                                    break;
                                case "cmdlogin":
                                    tag.RaiseEvent("onclick");
                                    tag.InvokeMember("Click");
                                    break;
                            }
                        }
                    }
                    _Processing = false;
                }
            }
        }
Karthi Keyan9y ago
@Amit,
Yes I Got It. Thankz Amit And Sameer for your valuable answers.
Sameer Shaik9y ago
you should declare a WebBrowser object here,
or else if you are using WebBrowser control on you Window form, the you should use its Name/Id to utilize in C# code.

as amit said, declaration should be
WebBrowser webBrowser=new WebBrowser();

or
If webBrowser1 is a control on winform,
this.webBrowser1.Navigate("some site login Page");
Karthi Keyan9y ago
@Amit,
No, i didn't decalared the webBrowser. This is my full set of code... go through this.

using System;
using System.Windows.Forms;
using System.Net;
using System.Configuration;
namespace Pronoun_Automation
{
public partial class Pronoun_Automation : Form
{
private bool _Processing;
public Pronoun_Automation()
{
InitializeComponent();
}
private void Pronoun_Automation_Load(object sender, EventArgs e)
{

}
public void load()
{
WebBrowser.Navigate("some site login Page");
_Processing = true;
var username = ConfigurationManager.AppSettings["username"];
var password = ConfigurationManager.AppSettings["password"];
while (_Processing)
{
Application.DoEvents();
if (WebBrowser.ReadyState == WebBrowserReadyState.Complete || WebBrowser.ReadyState == WebBrowserReadyState.Interactive)
{
var htmlDocument = this.WebBrowser.Document;
if (htmlDocument != null)
{
foreach (HtmlElement tag in htmlDocument.GetElementsByTagName("input"))
{
switch (tag.Name)
{
case "username":
tag.InnerText = username;
break;
case "password":
tag.InnerText = password;
break;
case "cmdlogin":
tag.RaiseEvent("onclick");
tag.InvokeMember("Click");
break;
}
}
}
_Processing = false;
}
}
}
}
}
Amit Gupta9y ago
Have you declared webbrowser variable static? If so then remove the static keyword from it.