source code or examples of how to use listboxes

//source code or examples of how to use listboxes

//try to develop same form
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;
namespace WindowsProject
{
public partial class Form7 : Form
{
public Form7()
{
InitializeComponent();
}
private void Form7_Load(object sender, EventArgs e)
{

//source code or examples of how to use listboxes
listBox1.Items.Add("AP");
listBox1.Items.Add("Tamilnadu");
listBox1.Items.Add("Karnataka");
listBox1.Items.Add("Kerala");
listBox1.Items.Add("Orissa");
listBox1.Items.Add("Maharastra");
string[] cols = { "Red", "Blue", "Green", "White", "Black", "Yellow", "Pink" };
checkedListBox1.Items.AddRange(cols);
}
private void comboBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if(Convert.ToInt32(e.KeyChar) == 13)
if(comboBox1.FindString(comboBox1.Text) == -1)
comboBox1.Items.Add(comboBox1.Text);
}
private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show(comboBox1.Text);
MessageBox.Show(comboBox1.SelectedIndex.ToString());
MessageBox.Show(comboBox1.SelectedItem.ToString());
}
private void button2_Click(object sender, EventArgs e)
{
foreach(object obj in listBox1.SelectedItems)
MessageBox.Show(obj.ToString());
}
private void button3_Click(object sender, EventArgs e)
{
string str = null;
foreach (object obj in checkedListBox1.CheckedItems)
str += obj.ToString() + ", ";
str = str.Substring(0, str.Length - 2);
int pos = str.LastIndexOf(",");
if (pos != -1)
{
str = str.Remove(pos, 1);
str = str.Insert(pos, " and");
}
MessageBox.Show(str);
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
}

how to use tags property in c#

//source code how to use tags property in c#
//try to devevlop the sme form it would be better
//it could also be used to develop cash system
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;
namespace WindowsProject
{
public partial class Form6 : Form
{
int count = 0;
public Form6()
{
InitializeComponent();
}
private void checkBox_CheckedChanged(object sender, EventArgs e)
{
int amt = int.Parse(txtAmount.Text);
CheckBox cb = sender as CheckBox;
if (cb.Checked)
{
count += 1;
amt += Convert.ToInt32(cb.Tag);
}
else
{
count -= 1;
amt -= Convert.ToInt32(cb.Tag);
}
txtAmount.Text = amt.ToString();
if (count == 0)
radioButton1.Checked = true;
}
private void radioButton_CheckedChanged(object sender, EventArgs e)
{
int amt = int.Parse(txtAmount.Text);
if (amt > 0)
{
RadioButton rb = sender as RadioButton;
if (rb.Checked)
amt += Convert.ToInt32(rb.Tag);
else
amt -= Convert.ToInt32(rb.Tag);
txtAmount.Text = amt.ToString();
}
else
radioButton1.Checked = true;
}
}
}

how to know which checkbox or radiobutton has clicked

//source codehow to know which checkbox or radiobutton has clicked
//try to crate the sme form as shon in fig.

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;

namespace WindowsProject
{
public partial class Form5 : Form
{
public Form5()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (radioButton1.Checked)
MessageBox.Show("Radio Button1 is selected");
else if (radioButton2.Checked)
MessageBox.Show("Radio Button2 is selected");
else if (radioButton3.Checked)
MessageBox.Show("Radio Button3 is selected");
}
private void button2_Click(object sender, EventArgs e)
{
if (checkBox1.Checked)
MessageBox.Show("Check Box1 is selected");
if (checkBox2.Checked)
MessageBox.Show("Check Box2 is selected");
if (checkBox3.Checked)
MessageBox.Show("Check Box3 is selected");
}
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked)
MessageBox.Show("Selected");
else
MessageBox.Show("De-Selected");
}
}
}

how to make validations in a textbox ,source code

how to make validations in a textbox ,source code
//try to make forms like this
//try to name as mentioned

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;

namespace WindowsProject
{
public partial class Form4 : Form
{
TextBox tb;
public Form4()
{
InitializeComponent();
}
private void btnSave_Click(object sender, EventArgs e)
{
//Code to save data into database
MessageBox.Show("Data saved");
}
private void btnClear_Click(object sender, EventArgs e)
{
// txtName.Clear(); txtPwd.Clear();
// txtCPwd.Text = txtAddress.Text = txtPhone.Text = "";
foreach (Control ctrl in this.Controls)
{
if (ctrl.GetType().Name == "TextBox")
{
TextBox tb = ctrl as TextBox;
tb.Clear();
}
}
txtName.Focus();
}
private void btnClose_Click(object sender, EventArgs e)
{
tb.CausesValidation = false;
this.Close();
}
private void txtName_Leave(object sender, EventArgs e)
{
tb = sender as TextBox;
}
private void txtName_Validating(object sender, CancelEventArgs e)
{
if (tb.Text.Trim().Length == 0)
{
MessageBox.Show("Cannot leave empty");
e.Cancel = true;
return;
}
if (tb.Name != "txtName")
{
if (tb.Text.Trim().Length < 6)
{
MessageBox.Show("Pwd should be randing between 6 to 12 chars");
e.Cancel = true; return;
}
}
if (tb.Name == "txtCPwd")
{
if (txtPwd.Text.Trim() != txtCPwd.Text.Trim())
{ MessageBox.Show("Confirm pwd should match with pwd");
e.Cancel = true; }
}
}
private void txtPhone_KeyPress(object sender, KeyPressEventArgs e)
{
//MessageBox.Show(Convert.ToInt32(e.KeyChar).ToString());
if (char.IsDigit(e.KeyChar) == false && Convert.ToInt32(e.KeyChar) != 8)
{
MessageBox.Show("Enter numerics only");
e.Handled = true;
}
}
}
}

to identify whic contoll is clicked

//to identify whic contoll is clicked

//create sush a form as shown in fig
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;
namespace WindowsProject
{
public partial class Form3 : Form
{
public Form3()
{
InitializeComponent();
}
private void button_Click(object sender, EventArgs e)
{
//Button b = (Button)sender;
Button b = sender as Button;
if (b.Name == "button1")
MessageBox.Show("Button1 is clicked");
else if (b.Name == "button2")
MessageBox.Show("Button2 is clicked");
else if (b.Name == "button3")
MessageBox.Show("Button3 is clicked");
}
private void Form3_Load(object sender, EventArgs e)
{
}
}
}

how to bind with different controlls

// source code how to bind with different controlls
//go to properties and add to any event
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;
namespace WindowsProject
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
private void Form2_Load(object sender, EventArgs e)
{
MessageBox.Show("Bound with multiple events of a control");
}
}
}

code for partial class

//code for partial class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace OOPSProj
{
partial class Partia
{
public void Method1()
{
Console.WriteLine("Method One");
}
public void Method2()
{
Console.WriteLine("Method Two");
}
}
}

source code for different function with return

//source code for different function with return
using System;
namespace OOPSProj
{
class Program
{
static void Main(string[] args)
{
Program p = new Program();
p.Test11();
p.Test22(2);
Console.WriteLine(p.Test33());
Console.WriteLine(p.Test44("leejo"));
int b = 0;
int a = p.Test55(100, 50, ref b);
Console.WriteLine(a + " " + b);
Console.ReadLine();
}
//No Input No Output
void Test11()
{
Console.WriteLine("First Method");
}
//No Output Has Input
void Test22(int x)
{
Console.WriteLine("Second Method: " + x);
}
//No Input Has Output
string Test33()
{
return "Third Method";
}
//Has Input & Output
string Test44(string name)
{
return "Hello " + name;
}
//Has Input & Multiple Outputs
int Test55(int x, int y, ref int z)
{
z = x * y;
return x + y;
}
}
}

how to consume interface fom diff project

//how to consume interface fom diff project
using System;
using OOPSProj;
namespace SecondProject
{
class Class1
{
static void Main()
{
Rectangle r = new Rectangle(134, 56);
Console.WriteLine(r.GetArea());
Console.WriteLine("Second Project Second Class");
Console.ReadLine();
}
}
}

source code for using abstact class

//source code for using abstact class
using System;
namespace OOPSProj
{
//code for inheritance
public class Rectangle : Figure
{
//code constuctor
public Rectangle(double width, double height)
{
base.width = width;
base.height = height;
}
public override double GetArea()
{
return width * height;
}
static void Main()
{
Rectangle r = new Rectangle(190, 45);
Console.WriteLine(r.GetArea());
Console.ReadLine();
}
}
}

source code for this pointer

using System;
namespace OOPSProject
{
class Params
{
int x, y; // Class Variables
Params(int x, int y) //Block Variables
{
this.x = x;
this.y = y;
}
void Add()
{
Console.WriteLine(x + y);
}
void Sub()
{
Console.WriteLine(x - y);
}
void Mul()
{
Console.WriteLine(x * y);
}
void Div()
{
Console.WriteLine(x / y);
}
static void Main()
{
Params obj = new Params(100, 50);
obj.Add(); obj.Sub(); obj.Mul(); obj.Div();
Console.ReadLine();
}
}
}

to declare object

//source code to declare object
using System;
namespace OOPSProj
{
class First
{
int x = 100;
static void Main()
{
First f11 = new First();
First f22 = f11;
f11 = null;
Console.WriteLine(f22.x); //Valid
Console.WriteLine(f12.x); //InValid
Console.ReadLine();
}
}
}

using c# code to use abstract and inheritance

//using c# code to use abstract and inheritance
sing System;
namespace OOPSProj
{
//code for inheritance
class Circle : Figure
{
public Circle(double radius)
{
base.radius = radius;
}
public override double GetArea()
{
return 3.14 * radius * radius;
}
static void Main()
{
Circle c = new Circle(45);
Console.WriteLine(c.GetArea());
Console.ReadLine();
}
}
}

how to declare abstract class

// source code how to declare abstract class
using System;
namespace OOPSProj
{
public abstract class Fig
{
public double width, height, radius;
public abstract double GetArea();
}
}

how to declare abstract class

// source code how to declare abstract class
using System;
namespace OOPSProj
{
public abstract class Fig
{
public double width, height, radius;
public abstract double GetArea();
}
}

code for using abstract class and in heritance

//code for using abstract class and in heritance
using System;
namespace OOPSProj
{//source code for inheritance
class AbstractChild : AbstractParent
{
public override void Mul1(int x, int y)
{
Console.WriteLine(x * y);
}
public override void Div1(int x, int y)
{
Console.WriteLine(x / y);
}
public void show9()
{
Console.WriteLine("hello");
}
static void Main()
{
AbsChild obj = new AbsChild();
AbsParent p = obj;
p.Add(100, 50); p.Sub(350, 45);
p.Mul(245, 35); p.Div(180, 30);
Console.ReadLine();
}
}
}

source code how to declare abstract class

//source code how to declare abstract class
using System;
namespace OOPSProj
{
abstract class AbstactParent
{
public void Add1(int x, int y)
{
Console.WriteLine(x + y);
}
public void Sub1(int x, int y)
{
Console.WriteLine(x - y);
}
public abstract void Mul1(int x, int y);
public abstract void Div1(int x, int y);
}
}

source code for assing values in jagged array

//source code for assing values in jagged array
using System;
class JagDemo
{
static void Main()
{
int[][] arr1 = new int[4][];
arr1[0] = new int[6];
arr1[1] = new int[8];
arr1[2] = new int[7];
arr1[3] = new int[5];
//Assigning values to jagged array
for(int i=0;i{
for(int j=0;jarr[i][j] = j + 1;
}

source code for assinging and printing values in jagged array

//c# source code for assinging and printing values in jagged array
using System;
class JagDemo
{
static void Main()
{
int[][] arr1 = new int[4][];
arr1[0] = new int[6];
arr1[1] = new int[8];
arr1[2] = new int[7];
arr1[3] = new int[5];
//Assigning values to jagged array
for(int i=0;i{
for(int j=0;jarr[i][j] = j + 1;
}
//Printing values from jagged array
for(int i=0;i{
foreach(int x in arr[i])
Console.Write(x + " ");
Console.WriteLine();
}
}
}

source code to import namespace

//source code to import namespace
using System;
class Using1Demo
{
static void Main()
{
Console.WriteLine("Importing a namespace inc#");
}

different type variable

// source code different type variable
using System;
class TypeDemo
{
static void Main()
{
var x1 = 100;
Console.WriteLine(x.GetType());
var s1 = "Hello";
Console.WriteLine(s.GetType());
var f1= 3.14f;
Console.WriteLine(f.GetType());
var b1 = true;
Console.WriteLine(b.GetType());
}
}

Assigning values and Printing values from 2d array

//source code for Assigning values and Printing values from 2d array
using System;
class TDArray
{
static void Main()
{
int[,] arr = new int[4,5];
int a = 5;
//Assigning values to 2d array;
for(int i=0;i{
for(int j=0;j{
arr[i,j] = a;
a += 5;
}
}
//Printing values from 2d array:
for(int i=0;i{
for(int j=0;jConsole.Write(arr[i,j] + " ");
Console.WriteLine();
}
}
}

source code forAssigning values to 2d array

//source code forAssigning values to 2d array;
using System;
class TDArray
{ //source code for array
static void Main()
{
int[,] arr = new int[4,5];
int a = 5;
// source code forAssigning values to 2d array;
for(int i=0;i{
for(int j=0;j{
arr[i,j] = a;
a += 5;
}
}

//source code for usin switch statement

//source code for usin switch statement
using System;
class SwitchDemo
{
static void Main()
{
Console.Write("Enter student no.(1-3): ");
int sno = int.Parse(Console.ReadLine());
switch(sno)
{
case 1:
Console.WriteLine("Student 1");
break;
case 2:
Console.WriteLine("Student 2");
break;
case 3:
Console.WriteLine("Student 3");
break;
default:
Console.WriteLine("Wrong student no.");
break;
}
}
}

source code for using if in c#

//source code for using if in c#
using System;
class IfDemo
{
static void Main()
{
int x, y;
Console.Write("Enter x value: ");
x = int.Parse(Console.ReadLine());
Console.Write("Enter y value: ");
y = int.Parse(Console.ReadLine());
if (x > y)
Console.WriteLine("x is greater");
else if(x < y)
Console.WriteLine("y is greater");
else
Console.WriteLine("Both are equal");
}
}

source code for using if in c#

//source code for using if in c#
using System;
class IfDemo
{
static void Main()
{
int x, y;
Console.Write("Enter x value: ");
x = int.Parse(Console.ReadLine());
Console.Write("Enter y value: ");
y = int.Parse(Console.ReadLine());
if (x > y)
Console.WriteLine("x is greater");
else if(x < y) Console.WriteLine("y is greater"); else Console.WriteLine("Both are equal"); } }

simple c# programme

//source code for simple porg
class Example
{
static void Main()
{
System.Console.WriteLine("Welcome to C#");
}
}

source code to return a value

//source code to return a value
using System;
namespace MyCsNsp
{
public class CSTest
{
public string CSMethod()
{
return "Hello from CSharp";
}
}
}

source code using for each loop and(integer) using command line argument

using System;
class AddParams
{
static void Main(string[] args)
{
int sum = 0;
foreach(string str in args)
sum += int.Parse(str);
Console.WriteLine(sum);

source code using for each loop and using command line argument

// using for each loop and using command line argument using System;
class AddParams
{

//fuusing command line argument
static void Main(string[] args)
{
int sum = 0;
foreach(string str in args)
sum += int.Parse(str);
Console.WriteLine(sum);
}
}

source code to create table

//source code to create table of a number
using System;
class RetDemo
{
static void Main()
{
//source function code to create table
Console.Write("Enter a numeric value: ");
int x = int.Parse(Console.ReadLine());
if (x < 2)
return;
for(int i=1;i<=10;i++)
Console.WriteLine("{0} * {1} = {2}", x, i, x*i);
}
}

using integer parsing code and source code for addition

//using integer parsing code and source code for addition

using System;
class VarDemo
{
//adddition source code
static void Main()
{
int x, y, z;
Console.Write("Enter x value: ");
x = int.Parse(Console.ReadLine());
Console.Write("Enter y value: ");
y = int.Parse(Console.ReadLine());
z = x + y;
Console.WriteLine("Sum of " + x + " and " + y + "is: " + z);
}
}

different type of function

//different type of function
using System;
namespace AccessDemo1
{
public class Program
{
//private function
private void Test1()
{
Console.WriteLine("Private Method");
}
//internal function
internal void Test2()
{
Console.WriteLine("Internal Method");
}
//protected function
protected void Test3()
{
Console.WriteLine("Protected Method");
}
//protected internal function
protected internal void Test4()
{
Console.WriteLine("Protected Internal Method");
}
//public function
public void Test5()
{
Console.WriteLine("Public Method");
}
static void Main(string[] args)
{
Program p = new Program();
p.Test1(); p.Test2(); p.Test3();
p.Test4(); p.Test5();
Console.ReadLine();
}
}
}