Practical Implementation of interface in C# .Net

Practical Implementation of interface in C# .Net……………………………

Steps 1 First we will add interface which name is ICustomer in our Windows Application

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace custmgmt

{

public interface ICustomer

{

int Compare(object ob1, object ob2);

}

}

Steps 2 Second step we add class which name is ObjectCollection.cs in our Windows Application

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace custmgmt

{

public class ObjectCollection

{

private object[] obar = new object[1];

private int index = -1;

public int GetIndex()

{

return index;

}

// .........................................

public int Add_Object(object value)

{

index++;

obar[index] = value;

Array.Resize(ref obar, obar.Length + 1);

return index;

}

//...............................................

public object GetValue(int myindex)

{

return obar[myindex];

}

//..............................................

int c;

public int Sort(ICustomer cmp)

{

for (int i = 0; i <index; i++)

{

for (int j= i+1; j <=index; j++)

{

c=cmp.Compare(obar[i],obar[j]);

if (c == 1)

swap(ref obar[i], ref obar[j]);

}

}

return c;

}

//..............................................

private void swap(ref object ob1, ref object ob2)

{

object temp = ob1;

ob1 = ob2;

ob2 = temp;

}

//...............................................

public int Delete_Object(int myindex)

{

int flag = 0;

for (int i = 0; i < obar.Length; i++)

{

if (i == myindex)

{

for (int j = i; j < obar.Length - 1; j++)

{

obar[j] = obar[j + 1];

}

flag = 1;

break;

}

}

return flag;

}

}

}

Step 3 then third steps we will add class which name is Customer and implement ICustomer in our Windows Application

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace custmgmt

{

class Customer :ICustomer

{

public static ObjectCollection obj = new ObjectCollection();

private int SrNo;

public int IntSrNo

{

get { return SrNo; }

set { SrNo = value; }

}

private string FirstName;

public string StrFirstName

{

get { return FirstName; }

set { FirstName = value; }

}

private string LastName;

public string StrLastName

{

get { return LastName; }

set { LastName = value; }

}

private DateTime Dob;

public DateTime DateTimeDob

{

get { return Dob; }

set { Dob = value; }

}

public void AddCustomer(Customer cus)

{

obj.Add_Object(cus);

}

public Customer SearchBySrNo(Customer cus)

{

for (int i = 0; i <=obj.GetIndex(); i++)

{

Customer cus1=(Customer)obj.GetValue(i);

if (cus.SrNo == cus1.SrNo)

{

cus.StrFirstName = cus1.StrFirstName;

cus.StrLastName = cus1.StrLastName;

cus.DateTimeDob = cus1.DateTimeDob;

return cus;

}

}

return null;

}

public int UpdateBySrNo(Customer cus)

{

for (int i = 0; i <= obj.GetIndex(); i++)

{

Customer cus1 = (Customer)obj.GetValue(i);

if (cus.SrNo == cus1.SrNo)

{

cus1.StrFirstName = cus.StrFirstName;

cus1.StrLastName = cus.StrLastName;

cus1.DateTimeDob = cus.DateTimeDob;

return 1;

}

}

return 0;

}

public int DeleteBySrNo(int ind)

{

int j=0;

for (int i = 0; i <= obj.GetIndex(); i++)

{

Customer c1 = (Customer)obj.GetValue(i);

if (c1.IntSrNo == ind)

{

j = obj.Delete_Object(i);

break;

}

}

return j;

}

public int Compare(object ob1, object ob2)

{

Customer cus1, cus2;

cus1 = (Customer)ob1;

cus2 = (Customer)ob2;

if (cus1.IntSrNo > cus2.IntSrNo)

return 1;

else if (cus2.IntSrNo < cus2.IntSrNo)

return -1;

else

return 0;

}

public Customer GetValue(int i)

{

Customer cus = new Customer();

cus =(Customer) obj.GetValue(i);

return cus;

}

}

}

Step 4 fourth steps we will code on Windows From and call all method of class which name is Customer

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace custmgmt

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

//code for How to Save data ............................

private void btnSave_Click(object sender, EventArgs e)

{

Customer cus = new Customer();

cus.IntSrNo = Convert.ToInt32(txtsrno.Text);

cus.StrFirstName = txtfname.Text;

cus.StrLastName = txtlname.Text;

cus.DateTimeDob = Convert.ToDateTime(txtdob.Text);

cus.AddCustomer(cus);

MessageBox.Show("Customer Added ...");

TextClear();

}

//code for How to sort data with SrNo ............................

private void btnsort_Click(object sender, EventArgs e)

{

Customer.obj.Sort(new Customer());

MessageBox.Show("Record Sorted..");

}

int temp;

//code for How retrive first  data from Array............................

private void btnfirst_Click(object sender, EventArgs e)

{

temp = 0;

Customer cus1;

cus1 = (Customer)Customer.obj.GetValue(temp);

txtsrno.Text = cus1.IntSrNo.ToString();

txtfname.Text = cus1.StrFirstName;

txtlname.Text = cus1.StrLastName;

txtdob.Text = cus1.DateTimeDob.ToString();

}

int i;

//code for How retrive last  data from Array............................

private void btnlast_Click(object sender, EventArgs e)

{

Customer cus1;

cus1 = (Customer)Customer.obj.GetValue(Customer.obj.GetIndex());

txtsrno.Text = cus1.IntSrNo.ToString();

txtfname.Text = cus1.StrFirstName;

txtlname.Text = cus1.StrLastName;

txtdob.Text = cus1.DateTimeDob.ToString();

}

//code for How to clear textbox control ............................

private void btnClear_Click(object sender, EventArgs e)

{

TextClear();

}

//method for TextClear.............

private void TextClear()

{

foreach (Control c in this.Controls)

{

if (c.GetType() == typeof(TextBox))

{

c.Text = "";

}

}

}

//Code for how to get Previouse data from Array.............

private void btnprv_Click(object sender, EventArgs e)

{

if (temp>0)

temp--;

Customer cus1;

cus1 = (Customer)Customer.obj.GetValue(temp);

txtsrno.Text = cus1.IntSrNo.ToString();

txtfname.Text = cus1.StrFirstName;

txtlname.Text = cus1.StrLastName;

txtdob.Text = cus1.DateTimeDob.ToString();

}

//Code for how to get Next data from Array.............

private void btnNext_Click(object sender, EventArgs e)

{

if (temp < Customer.obj.GetIndex())

temp++;

Customer cus1;

cus1 = (Customer)Customer.obj.GetValue(temp);

txtsrno.Text = cus1.IntSrNo.ToString();

txtfname.Text = cus1.StrFirstName;

txtlname.Text = cus1.StrLastName;

txtdob.Text = cus1.DateTimeDob.ToString();

}

//Code for how to Search data from Array with SrNo.............

private void btnSearch_Click(object sender, EventArgs e)

{

Customer cus1=new Customer();

cus1.IntSrNo = Convert.ToInt32(txtsrno.Text);

cus1=cus1.SearchBySrNo(cus1);

if (cus1 != null)

{

txtsrno.Text = cus1.IntSrNo.ToString();

txtfname.Text = cus1.StrFirstName;

txtlname.Text = cus1.StrLastName;

txtdob.Text = cus1.DateTimeDob.ToShortDateString();

}

else

{

MessageBox.Show("SrNo is not found");

}

}

//Code for how to delete data from Array with SrNo.............

private void btnDelete_Click(object sender, EventArgs e)

{

Customer cus1 = new Customer();

int r=cus1.DeleteBySrNo(Convert.ToInt32(txtsrno.Text));

if (r == 1)

MessageBox.Show("Deleted Sucessfull.");

else

MessageBox.Show("not found");

}

//Code for how to update data from Array with SrNo.............

private void btnUpdate_Click(object sender, EventArgs e)

{

Customer cus1 = new Customer();

cus1.IntSrNo = Convert.ToInt32(txtsrno.Text);

cus1.StrFirstName = txtfname.Text;

cus1.StrLastName = txtlname.Text;

cus1.DateTimeDob = Convert.ToDateTime(txtdob.Text);

int  i=cus1.UpdateBySrNo(cus1);

if (i == 1)

{

MessageBox.Show("Update Successfully");

}

else

{

MessageBox.Show("SrNo  is  not Found");

}

}

}

}