An object reference is required for the nonstatic field, method, or property 'WindowsApplication1.Form1.TextboxText().. same with labels

Question

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An object reference is required for the nonstatic field, method, or property 'WindowsApplication1.Form1.setTextboxText(int)

i am creating an IP tracer, which will connect to web and put value(IP) from textbox and will recieve the result. here is the code.

 using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;
    using System.Xml;

    namespace geoIP
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }

            private void button1_Click(object sender, EventArgs e)
            {
                iptrace();
            }

             public static string iptrace()
            {
                XmlDocument xmldoc = new XmlDocument();
                XmlNodeList xmlnode;
                int i;

                xmldoc.Load("http://freegeoip.net/xml/" + textBox1.Text);
                xmlnode = xmldoc.GetElementsByTagName("response");
                for (i = 0; i < xmlnode.Count; i++)
                {
                    xmlnode[i].ChildNodes.Item(0).InnerText.Trim();
                    label1.Text = "Ip Address: " + xmlnode[i].ChildNodes.Item(0).InnerText.Trim();
                    label2.Text = "Country Code: " + xmlnode[i].ChildNodes.Item(1).InnerText.Trim();
                    label3.Text = "Country Name: " + xmlnode[i].ChildNodes.Item(2).InnerText.Trim();
                    label4.Text = "Region Code: " + xmlnode[i].ChildNodes.Item(3).InnerText.Trim();
                    label5.Text = "Region Name: " + xmlnode[i].ChildNodes.Item(4).InnerText.Trim();
                    label6.Text = "City: " + xmlnode[i].ChildNodes.Item(5).InnerText.Trim();
                    label7.Text = "Zip Code: " + xmlnode[i].ChildNodes.Item(6).InnerText.Trim();
                    label8.Text = "Latitude: " + xmlnode[i].ChildNodes.Item(7).InnerText.Trim();
                    label9.Text = "Longitude: " + xmlnode[i].ChildNodes.Item(8).InnerText.Trim();
                    label10.Text = "Metro Code: " + xmlnode[i].ChildNodes.Item(9).InnerText.Trim();
                }

            }


 }
}`

it giving me error

An object reference is required for the non-static field, method, or property 'geoIP.Form1.textBox1'

Solution

your textBox1 control is declared like a member of the class, but used inside static function. That is a problem.

To fix this, you need to declare method non static

public string iptrace()
{
   ...
}

Comments

[DeadAlive]

i removed it after that public string iptrace() { ... } it saying 'geoIP.Form1.iptrace()': not all code paths return a value

[DeadAlive]

i removed it after that public string iptrace() { ... } it saying 'geoIP.Form1.iptrace()': not all code paths return a value

[sgoodman]

Your method declaration is public string iptrace() {...}. You need to return a string value from it. But since you are just processing and don't expect anything returned, change the declaration to public void iptrace() {...}.

[DeadAlive]

done, have you got any logical error in this source?

[DeadAlive]

done, have you got any logical error in this source?

[sgoodman]

Added few more tips to the answer. Don't see any logical error.

[DeadAlive]

then why its not showing result :(

[sgoodman]

@jammyhunt Do you get an error? Is the method iptrace() called at all? Check if the button1_Click event handler is correctly bound to button1's Click event.

[DeadAlive]

i found the bug :D xmlnode = xmldoc.GetElementsByTagName("response"); it should be Response insted of responce

[Tigran]

You defin your function with rturn type string, so return a string value at the end. If you dont't need a string define function wih return type void.