Aspdotnet.Sunil Kumar

Friday, August 08, 2014

How To Find Name Of The Day from Date In Asp.net

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Drawing;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

DateTime dt = new DateTime(2014, 8, 8);

Response.Write(dt.ToString("dddddddddd"));

}

How To Evaluate Mathematical/Arithmatic Expression string Expression In asp.net

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

<div>

<legend>Evaluate String Arithmetic Expression</legend>

<asp:TextBox ID="TxtEquation" runat="server"></asp:TextBox>

<asp:Button ID="BtnCalculate" runat="server" Text="Calculate"

onclick="btnCalculate_Click" />

<asp:Button ID="btnReset" runat="server" Text="Reset"

onclick="btnReset_Click" />

<br />

<asp:Label ID="lblResult" runat="server" Text=""></asp:Label>

</fieldset>

</div>

</form>

</body>

</html>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Drawing;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

private object EvaluateExpression(string Equation)

{

DataTable dt = new DataTable();

var Result = dt.Compute(Equation, string.Empty);

return Result;

}

protected void btnReset_Click(object sender, EventArgs e)

{

TxtEquation.Text = "";

TxtEquation.Focus();

}

protected void btnCalculate_Click(object sender, EventArgs e)

{

try

{

var Result = Convert.ToString(EvaluateExpression(TxtEquation.Text.Trim()));

lblResult.Text = " Your Result" + Result;

lblResult.ForeColor = Color.Blue;

}

catch (Exception ex)

{

lblResult.Text = "Ooops!" + ex.Message.ToString();

lblResult.ForeColor = Color.Red;

}

Thursday, August 07, 2014

Custom Validator For Email And Mobile Number in Asp.net

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

<div>

<table>

<tr>

<td >

Email</td>

<td>

<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>

<asp:CustomValidator ID="CustomValidator1" runat="server"

ControlToValidate="TextBox3" ErrorMessage="Enter Valid Email" Font-Bold="True"

ForeColor="Red" onservervalidate="Validate_Email"></asp:CustomValidator>

</td>

</tr>

<tr>

<td>

Mobile</td>

<td>

<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>

<asp:CustomValidator ID="CustomValidator2" runat="server"

ControlToValidate="TextBox4" Display="Dynamic"

ErrorMessage="Enter Valid mobile " ForeColor="Red"

onservervalidate="Validate_Mobile"></asp:CustomValidator>

</td>

</tr>

<tr>

<td >

<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Save" />

</td>

</tr>

</table>

</div>

</form>

</body>

</html>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Text.RegularExpressions;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Validate_Email(object source, ServerValidateEventArgs e)

{

//System.Text.RegularExpressions.Regex r = new System.Text.RegularExpressions.Regex("^[0-9]+$");

System.Text.RegularExpressions.Regex r = new System.Text.RegularExpressions.Regex(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");

e.IsValid = r.IsMatch(TextBox3.Text);

}

protected void Validate_Mobile(object source, ServerValidateEventArgs e)

{

System.Text.RegularExpressions.Regex r = new System.Text.RegularExpressions.Regex(@"^[987]+\d{9}$");

e.IsValid = r.IsMatch(TextBox4.Text);

}

protected void Button1_Click(object sender, EventArgs e)

{

}

Wednesday, August 06, 2014

How To Generate Random Password in Asp.net And C#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class Auto_Generate_password : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

public static string NewRandomPassword(int PasswordLength)

{

string _allowedChars = "0123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ";

Random randNum = new Random();

char[] chars = new char[PasswordLength];

int allowedCharCount = _allowedChars.Length;

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

{

chars[i] = _allowedChars[(int)((_allowedChars.Length) * randNum.NextDouble())];

}

return new string(chars);

}

protected void Button1_Click(object sender, EventArgs e)

{

Label1.Text = NewRandomPassword(10);

}

Monday, August 04, 2014

How To Create your own captcha image generator in asp.net using c#.net

The below example will generate a captcha code with numbers and alphabets (small and capital letters). You can change the variable “combination” value according to your requirement.

Create two pages Captcha_image.aspx and Registration.aspx

Captcha_image.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Captcha_image.aspx.cs" Inherits="Captcha_image" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

</form>

</body>

</html>

Captcha_image.aspx.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Drawing.Imaging;

using System.Data.SqlClient;

using System.Text;

public partial class Captcha_image : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (Session["captcha"]!= null)

{

int height = 30;

int width = 100;

Bitmap bmp = new Bitmap(width, height);

RectangleF rectf = new RectangleF(10, 5, 0, 0);

Graphics g = Graphics.FromImage(bmp);

g.Clear(Color.White);

g.SmoothingMode = SmoothingMode.AntiAlias;

g.InterpolationMode = InterpolationMode.HighQualityBicubic;

g.PixelOffsetMode = PixelOffsetMode.HighQuality;

g.DrawString(Session["captcha"].ToString(), new Font("Thaoma", 12, FontStyle.Italic), Brushes.Green, rectf);

g.DrawRectangle(new Pen(Color.Red), 1, 1, width - 2, height - 2);

g.Flush();

Response.ContentType = "image/jpeg";

bmp.Save(Response.OutputStream, ImageFormat.Jpeg);

g.Dispose();

bmp.Dispose();

}

Registration.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Registration.aspx.cs" Inherits="Registration" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

<div>

<asp:ScriptManager ID="SM1" runat="server">

</asp:ScriptManager>

<table style="border: solid 1px black; padding: 20px; position: relative; top: 50px;"

align="center">

<tr>

<td>

Email ID :

</td>

<td>

<asp:TextBox ID="txtEmailID" runat="server" Width="200px"></asp:TextBox>

</td>

</tr>

<tr>

<td>

Password :

</td>

<td>

<asp:TextBox ID="txtPassword" runat="server" TextMode="Password" Width="200px"></asp:TextBox>

</td>

</tr>

<tr>

<td>

Confirm Password :

</td>

<td>

<asp:TextBox ID="txtConfirmPassword" runat="server" TextMode="Password" Width="200px"></asp:TextBox>

</td>

</tr>

<tr>

<td>

Enter Below Code :

</td>

<td>

<asp:TextBox ID="txtCaptcha" runat="server" Width="200px"></asp:TextBox>

</td>

</tr>

<tr>

<td>

</td>

<asp:UpdatePanel ID="UP1" runat="server">

<table>

<tr>

<asp:Image ID="imgCaptcha" runat="server" />

</td>

<asp:Button ID="btnRefresh" runat="server" Text="Refresh" OnClick="btnRefresh_Click" />

</td>

</tr>

</table>

</ContentTemplate>

</asp:UpdatePanel>

</td>

</tr>

<tr>

<asp:Button ID="btnRegiser" runat="server" Text="Register" OnClick="btnRegister_Click" />

</td>

</tr>

</table>

</div>

</form>

</body>

</html>

Registration.aspx.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Drawing.Imaging;

using System.Data.SqlClient;

using System.Text;

public partial class Registration : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

FillCapctha();

}

void FillCapctha()

{

try

{

Random random = new Random();

string combination = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

StringBuilder captcha = new StringBuilder();

for (int i = 0; i < 6; i++)

captcha.Append(combination[random.Next(combination.Length)]);

Session["captcha"] = captcha.ToString();

imgCaptcha.ImageUrl = "Captcha_image.aspx?" + DateTime.Now.Ticks.ToString();

}

catch

{

throw;

}

protected void btnRegister_Click(object sender, EventArgs e)

{

if (Session["captcha"].ToString() != txtCaptcha.Text)

Response.Write("Invalid Captcha Code");

else

Response.Write("Valid Captcha Code");

FillCapctha();

}

protected void btnRefresh_Click(object sender, EventArgs e)

{

FillCapctha();

}

RESULT

Aspdotnet.Sunil Kumar

Share Blog

Friday, August 08, 2014

How To Find Name Of The Day from Date In Asp.net

How To Evaluate Mathematical/Arithmatic Expression string Expression In asp.net

Thursday, August 07, 2014

Custom Validator For Email And Mobile Number in Asp.net

Wednesday, August 06, 2014

How To Generate Random Password in Asp.net And C#

Monday, August 04, 2014

How To Create your own captcha image generator in asp.net using c#.net

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