Add Check Box in Calender Control and Select WeekEnds on click of Button

Format Calender Controls :

Add Check Boxes manually in Calender Control and Select Week Ends on click of Button.

Code :

Partial Class SelectWeekEnds
    Inherits System.Web.UI.Page

    Dim btnclick As Boolean = False

    Protected Sub Calendar1_DayRender(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DayRenderEventArgs) Handles Calendar1.DayRender
        Dim ctl As New CheckBox
        ctl.ID = "chk" & e.Day.Date.ToString.Substring(0, 10)
        If btnclick = True Then
            If CInt(e.Day.Date.DayOfWeek) = 0 Or CInt(e.Day.Date.DayOfWeek) = 6 Then
                ctl.Checked = True
            End If
        End If
        e.Cell.Controls.Add(ctl)
    End Sub

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        btnclick = True
    End Sub

End Class

Add Check Box in Calender Control

Add Checkbox in Calender Control manually.

Code :

Partial Class SelectWeekEnds
  Inherits System.Web.UI.Page

  Protected Sub Calendar1_DayRender(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DayRenderEventArgs) Handles Calendar1.DayRender
      Dim ctl As New CheckBox
      ctl.ID = "chk" & e.Day.Date.ToString.Substring(0, 10)
      e.Cell.Controls.Add(ctl)
  End Sub  

End Class

Regular Expression for Alphanumeric using Javascript

You can use Javascripts to validate this as followes.

Define the Javascript Function "isNumberEvt" on Head Section. and check it on keypress even of text box like "onkeypress="return isNumberEvt(event)"".

Javascript :

    function isNumberEvt(evt)
    {

        var charCode = (evt.which) ? evt.which : event.keyCode
        if ((charCode > 31 && charCode <> 57 && charCode <> 90 && charCode <> 122))
        return false;

        return true;

    }

aspx:

call function onkeypress="return isNumberEvt(event)" even of Textbox.

    asp:textbox id="TextBox1" onkeypress="return isNumberEvt(event)" runat="server" width="238px"

Check for Internet Connection availability in ASP. Net

Following code Check for Internet Connection availability in ASP. Net

Code :

Partial Class frmChkInternetConnection
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If fnChkInternetConn() Then
            Response.Write("Congrats ! Internet Connection is Available.")
        Else
            Response.Write("Sorry ! Internet Connection is not Available.")
        End If
    End Sub

    Public Function fnChkInternetConn() As Boolean
        Dim objreq As System.Net.HttpWebRequest
        Dim objres As System.Net.HttpWebResponse
        Try
            objreq = CType(System.Net.HttpWebRequest.Create("http://www.google.com"), System.Net.HttpWebRequest)
            objres = CType(objreq.GetResponse(), System.Net.HttpWebResponse)
            objreq.Abort()
            If objres.StatusCode = System.Net.HttpStatusCode.OK Then
                Return True
            End If
        Catch weberrt As System.Net.WebException
            Return False
        Catch except As Exception
            Return False
        End Try
    End Function
End Class

To Validate Only Digits Using JavaScript

Valdate Textbox to accept only Digits using Javascript.

Use this function on "keyup" event of Textbox.

Javascript:

    function isDigit(evt)
    {
        var charCode = (evt.which) ? evt.which : event.keyCode

        if (charCode > 47 && charCode < 58)
        { 
            return true;
        }
        else
        {   
            return false;
        }      
    }

aspx:

 asp:textbox id="TextBox1" onkeyup="return isDigit(event)" runat="server" width="238px" 

Validate the Maximum no. of Characters allowed in TextBox Using Java Script.

Function for Check and limit the number of characters allowed in a Textbox.

CheckLength(txt,5) : It will allow only 5 Characters in text box.

Javascript :

    function CheckLength(obj,Length)
    {
        if (obj.value.length>Length)
        {
            alert("Exceeding Maximum " + Length +" Characters")
            obj.focus()
            obj.select()
        }
    } 

aspx :

asp:textbox id="TextBox1" onkeyup="CheckLength(this,5)" runat="server" width="238px" 

To Validate Numbers Using JavaScript

Use the following function to Check the object does ahve a Numeric value or not.

javascript :

    function Validatenumber(obj)
    {
        if (obj.length !=0)
        {
            var text = /^[-0-9]+$/;

            if ((document.getElementById(obj.id).value != "") && (!text.test(document.getElementById(obj.id).value)))
            {
                alert("Please enter numeric values only");
                obj.focus();
                obj.select();
            }
        }
    }

For Validating the Year Value Using Javascript ...

The following code used to validate "Year" using javascript.

Javascript :

    function ValidateYear(obj)
    {
        if (obj.length !=0)
        {
            var text = /^[0-9]+$/;

            if ((document.getElementById(obj.id).value != "") && (!text.test(document.getElementById(obj.id).value)))
            {
                alert("Please Enter Numeric Values Only");
                obj.focus();
                obj.select();
            }

            if (document.getElementById(obj.id).value.length>4)
            {
                alert("Year is not proper. Please check");
                obj.focus();
                obj.select();
            }
        }
    }

Reverse the String Using JavaScript

Use the following function to reverse the string using javascript

Example : reverseStr('KnowledgeParlour')

Output    : 'ruolraPegdelwonK'

Javascript :

    function reverseStr(str) 
    {
        if (!str) return; // nothing to change
        var rstr = '';
        for (i=str.length-1;i>=0;i--) 
        {
            rstr += str.charAt(i);
        }
        return rstr;
    }

Function to Validate Number of Digits Before and After Decimal Point in TextBox

Usage : On KeyPress Event we Can call the function to Validate the Text Box.

ChkDecimalNumbers(txtNo,e,2,3)

Parameter : Textbox , KeyPressEventArgs , Number of Digits before Decimal & Number of Digits After Decimal

Output :22.987

Asc(x.KeyChar) = 8 : It Represent BackSpace

    Code :

    Shared Sub ChkDecimalNumbers(ByVal ctxt As TextBox, ByVal x As System.Windows.Forms.KeyPressEventArgs, ByVal bfrDec As Int16, ByVal aftDec As Int16)
        If (Char.IsControl(x.KeyChar) Or Char.IsDigit(x.KeyChar) = True) Or x.KeyChar = "." Or Asc(x.KeyChar) = 8 Then
            If ctxt.Text.IndexOf(".") <> -1 Then
                If x.KeyChar = "." Then
                    x.Handled = True
                End If
                If ctxt.SelectionStart >= 0 And Asc(x.KeyChar) <> 8 Then
                    If (((Mid(ctxt.Text, ctxt.Text.IndexOf(".") + 1).Length > aftDec And ctxt.SelectionStart > ctxt.Text.IndexOf(".")) Or (Mid(ctxt.Text, 1, ctxt.Text.IndexOf(".") + 1).Length > bfrDec And ctxt.SelectionStart < selectionlength = 0))) Then
                        x.Handled = True
                    End If
                End If
            Else
                If (aftDec = 0 And x.KeyChar = ".") Or (((Mid(ctxt.Text, 1).Length > bfrDec - 1 And x.KeyChar <> "." And Asc(x.KeyChar) <> 8) Or (ctxt.SelectionStart > bfrDec And x.KeyChar.ToString.Equals("."))) And ctxt.SelectionLength = 0) Then
                    x.Handled = True
                End If
            End If
        Else
            x.Handled = True
        End If
    End Sub