Dotnet Control, ASP.Net Tips with C#, Javascript Code, HTML Basic, Learning XML

Thursday, August 16, 2012

Command Line Argument in C Sharp

What is command line argument?

class Program

{

static void Main(string[] args)

{

foreach (string s in args)

{

Console.WriteLine(s);

}

Console.ReadKey();

}

Jagged Array

What is jagged array?

class Program

{

static void Main(string[] args)

{

int[][] arr = new int[3][]; // Jagged array

int[] x1 = { 1,2,3,4,5,6,7,8,9,0};

int[] x2 = { 1,3,5,7,9};

int[] x3 = { 2,4,6,8};

arr[0] = x1;

arr[1] = x2;

arr[2] = x3;

for (int j = 0; j < 3; j++)

{

for (int i = 0; i < arr[j].Length; i++)

{

Console.Write(arr[j][i].ToString()+ ", ");

}

Console.WriteLine();

}

Constructor in C Sharp

Constructor: Is like a function without return type, its name must be same as class name.

Q1. How many type of constructor are there in C#?

1. System defined default constructor - > when user does not define constructor then compile implicitly provides default constructor.

2. User defined constructor -> when user explicitly provides constructor. After that implicit default constructor will not be loaded, if needed then have to define explicitly.

3. User Defined Parameterized constructor -> constructor with argument ex. SqlConnection(string conStr)

4. Static, public, private, protected, internal etc.

Q2. What is constructor chaining?

When we call constructor with new keyword and try to create object of class then it first it go to super class constructor to initialise super class first and then it come to initialise calling constructor’s class. See example of Q4.

Q3. How to pass data to base class?

Through BASE keyword, see example of Q4

Q4. What is overloaded constructor?

More than one constructor in a class is known as overloaded constructor. See example of Q4

Q5. What is static Constructor?

Constructor with static keyword,

It will be called only once during program’s lifecycle, when first object of class will be created

It cannot have access modifier and

Only one static constructor a class can have.

Q6. What will be the O/P of programs?

public class A

{

public A()

{

Console.WriteLine("A");

}

public class B:A

{

public B()

{

Console.WriteLine("B");

}

class Program

{

static void Main(string[] args)

{

B objB = new B();

Console.WriteLine("C");

Console.ReadKey();

}

public class A

{

static A() // this static constructor will called only once

{

Console.WriteLine("A");

}

public A(int x)

{

Console.WriteLine("A1");

}

public class B : A

{

public B():base(1)

{

Console.WriteLine("B");

}

class Program

{

static void Main(string[] args)

{

B objB = new B();

Console.WriteLine("C");

Console.ReadKey();

}

public class B

{

private B()

{

Console.WriteLine("B");

}

class Program

{

static void Main(string[] args)

{

B objB = new B();

Console.WriteLine("C");

Console.ReadKey();

}

public class B

{

public static B()

{

Console.WriteLine("B");

}

class Program

{

static void Main(string[] args)

{

B objB = new B();

Console.WriteLine("C");

Console.ReadKey();

}

Thursday, July 7, 2011

Check All Check box in Grid View Control without Postback

JavaScript

<script type="text/javascript" language="javascript">

function checkAllBoxes(grid, num)

{

var totalChkBoxes = parseInt(num);

var gvControl = document.getElementById(grid);

var gvChkBoxControl = "chkBoxChild";

var mainChkBox = document.getElementById("chkBoxAll");

var inputTypes = gvControl.getElementsByTagName("input");

for(var i = 0; i < inputTypes.length; i++)

{

if(inputTypes[i].type == 'checkbox' && inputTypes[i].id.indexOf(gvChkBoxControl,0) >= 0)

inputTypes[i].checked = mainChkBox.checked;

}

}

</script>

Grid View Control

<asp:GridView ID="grdDR" runat="server">

<Columns>

<asp:TemplateField>

<HeaderTemplate>

<input id="chkBoxAll" type="checkbox"

onclick="checkAllBoxes('<%= grdDR.ClientID %>', '<%= grdDR.Rows.Count %>')" />

</HeaderTemplate>

<ItemTemplate>

<asp:CheckBox ID="chkBoxChild" runat="server" />

</ItemTemplate>

</asp:TemplateField>

<asp:BoundField DataField="Trns ID" HeaderText="Trns ID" >

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />

</asp:BoundField>

<asp:BoundField DataField="User" HeaderText="User" >

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />

</asp:BoundField>

<asp:BoundField DataField="Deposit Amount" HeaderText="Deposit Amount" >

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />

</asp:BoundField>

Monday, May 23, 2011

Row Number in GridView

<asp:GridView ID="grd_Select" runat="server" AutoGenerateColumns="False" Width="100%" CssClass="mGrid" >

<asp:TemplateField HeaderText="SNo">

<%# Container.DataItemIndex + 1 %>

</ItemTemplate>

</asp:TemplateField>

<asp:BoundField DataField="User_Id" HeaderText="UserID" />

</Columns>

</asp:GridView>

Grid View Row Color on RewDataBound Event

Grid View:

<asp:GridView ID="grd_List" runat="server" AutoGenerateColumns="False" onrowdatabound="grd_List_RowDataBound">

<asp:BoundField DataField="Status" HeaderText="Status" ReadOnly="true">

</asp:BoundField>

<asp:BoundField DataField="Product" HeaderText="Product" ReadOnly="true">

</asp:BoundField>

</Columns>

</asp:GridView>

Grid View RewDataBound Event:

protected void grd_DenominationList_RowDataBound(object sender, GridViewRowEventArgs e)

{

if (e.Row.RowType == DataControlRowType.DataRow)

{

DataRowView drv = (DataRowView)e.Row.DataItem;

if (drv["Status"].ToString() == "Close")

{

e.Row.BackColor = System.Drawing.Color.Salmon;

}

else if (drv["Status"].ToString() == "Open")

{

e.Row.BackColor = System.Drawing.Color.LightGreen;

}

Repeater Row Color on ItemDataBound Event

Repeater:

<asp:Repeater ID="rep_ServiceStatus" runat="server"

onitemcommand="rep_ServiceStatus_ItemCommand"

onitemdatabound="rep_ServiceStatus_ItemDataBound">

<div class="header">Change User Service Status</div>

<tbody>

<tr>

</tr>

</HeaderTemplate>

<td><asp:LinkButton ID="lnk_ChangeStatus" runat="server" CommandName='<%#Eval("ServiceRegistrationID")%>' CommandArgument='<%#Eval("ServiceStatus")%>'>Change Status</asp:LinkButton></td>

</tr>

</ItemTemplate>

</table>

</div>

</FooterTemplate>

</asp:Repeater>

ItemDataBound Event of Repeater

protected void rep_ServiceStatus_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
foreach (Control c in e.Item.Controls)
{
if (c is System.Web.UI.HtmlControls.HtmlTableRow)
{
HtmlTableRow tr = (HtmlTableRow)c;
foreach (Control c1 in tr.Controls)
{
LinkButton myLink = (LinkButton)c1.FindControl("lnk_ChangeStatus");
if (myLink.CommandArgument.ToString() == "Active")
{
tr.BgColor = "#99FFCC";
}
else if (myLink.CommandArgument.ToString() == "InActive")
{
tr.BgColor = "#FFCCFF";
}
}
}
}
}
}

ASP Dot Net Tips With C Sharp

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Thursday, August 16, 2012

Command Line Argument in C Sharp

Jagged Array

Constructor in C Sharp

Thursday, July 7, 2011

Check All Check box in Grid View Control without Postback

Monday, May 23, 2011

Row Number in GridView

Grid View Row Color on RewDataBound Event

Repeater Row Color on ItemDataBound Event