.Net Tips : LINQ TakeWhile Method Example With C#.Net and VB.Net

You can get element from array until your given condition is satisfied.
TakeWhile LINQ method to return elements starting from the beginning of the array until a number is read whose value satisfied according to our given criteria.


Here is LINQ "TakeWhile" Method example.

.Net Tips : Check sequence of elements in two arrays are equal or not using LINQ With C#.Net and VB.Net Example

Using LINQ we can check sequence match on all elements in same order for two different array.
We are using "SequenceEqual" LINQ method to check. This method returns "true" if sequence match else return "false".

Here is LINQ "SequenceEqual" Method example.

.Net Tips: Check that particular word or string part contains in string array using LINQ "Any" method With C#.Net and VB.Net Examples

There are situations were we have string array which contains many value and we want to check that particular word or string part exist in all values.
We want to avoid iteration of array at that time we can use LINQ's "Any" method. Using one line code we can check.

Here is example for this :
In this example we take on string array "ProductArray" and insert some values. Now we want to check that "er" word is contain any values of this array or not using "Contains" method. You can check output below.

C#. Net Example :

        string[] ProductArray = { "CPU", "Computer", "DVD", ".Net" };

        bool isExist = ProductArray.Any(o => o.Contains("er"));

        Response.Write("There is a word in the list that contains 'er': <b>" + isExist + "</b>");

VB.Net Examples :

        Dim ProductArray As String() = {"CPU", "Computer", "DVD", ".Net"}

        Dim isExist As Boolean = ProductArray.Any(Function(o) o.Contains("er"))

        Response.Write("There is a word in the list that contains 'er': <b>" & isExist & "</b>")

Output :

.Net Tips: Convert two dimensional array in to Dictionary object using LINQ With C#.Net and VB.Net Examples

Using LINQ we can convert array in to dictionary object. We can use "ToDictionary" LINQ method to get dictionary object from array.
But we need to make sure that the key value should be unique in array, otherwise it will generate error "An item with the same key has already been added.".

Here is example for that.
In this example we take one two dimensional array "CustomerDetails". This array contains ID and Name of customer. Now using "ToDictionary" method of this array we can get dictionary object of type "Dictionary<int, string>". You can get your desirable type of Dictionary object.

Get only specific type of value from array which contains many types of values from object array using LINQ With C#.Net and VB.Net Examples

Using LINQ we can get specific type of object from Object Type array which contains many types of object. We are using "OfType" generic method to return only the elements of the array that  we specified.

Here is example for this.
In this example we take one array whose type is object and which contains many types of object, i.e. string, integer, double, Dictionary etc...
Now we get only doubles value using LINQ and display, after that, we get Dictionary object using LINQ and display. You can see the output for that.

Beginning .Net : Convert or Cast from one date format to another date format in ASP.Net With C#.Net and VB.Net Examples

You can easily do date time conversion in ASP.Net. You can convert date time from one format to other format.

In real application when data comes from external sources at that time chances increase for date time conversion error because both sender and receiver of data has different local date format setting.

May be you want to display or store date time in different format. If you know that date format that come from outside and you need in different format at that time your task become easy.

Here is example for this.
In this, we have one date in string variable in "MM/dd/yyyy" format. Now we convert this date in "dd/MM/yyyy" format. We are using "TryParseExact" method to parse and create DateTime object from date string after that, we convert in our desire format using "ToString" method. You can convert in any date time format.

Make dropdown list auto complete or searchable or filtering using JQuery with ASP.Net Dropdownlist Control

Click Here to Download Autocomplete And Fancy Dropdown boxes.zip
Also Download From this Link : Download Autocomplete And Fancy Dropdown boxes.zip

There is a situation where you have a large amount of value in dropdown list and you want to make that dropdown user-friendly. You want auto search functionality in ASP.Net Dropdownlist control.

You want one textbox inside dropdown list and when user type something in that textbox dropdown list become searchable and it will display only those records which were matched within textbox without doing any postback.

We can do this using Javascript and JQuery. We are using one JQuery plug-in for that. Plug-in name is "Chosen".

Here is example for ASP.NET Autocomplete DropDown.

In this example we take ASP.Net dropdown control and fill countries name into that, after that when user click on that combobox by default dropdown list is open and on first position you can see the textbox when you type in textbox dropdown list control become search-able and this list if automatically filter.

You can also get selected value in server side code using "SelectedValue" property of comobox. In this example when user click on "GetSelected" button at that time server side button click event called and display selected value in label. You can see that in below output screens.

ASPX Code :

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

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <style>
        a img{border: none;}
        ol li{list-style: decimal outside;}
        div#container{width: 780px;margin: 0 auto;padding: 1em 0;}
        div.side-by-side{width: 100%;margin-bottom: 1em;}
        div.side-by-side > div{float: left;width: 50%;}
        div.side-by-side > div > em{margin-bottom: 10px;display: block;}
        .clearfix:after{content: "\0020";display: block;height: 0;clear: both;overflow: hidden;visibility: hidden;}
        
    </style>
    <link rel="stylesheet" href="Style/chosen.css" />
</head>
<body>
    <form runat="server" id="form1">
        <div id="container">
            <h2>Selected Value :
                <asp:Label runat="server" ID="lblSelectedValue" Style="color: red"></asp:Label></h2>
            <div class="side-by-side clearfix">

                <div>

                    <asp:DropDownList data-placeholder="Choose a Country..." runat="server" ID="cboCountry" class="chzn-select" Style="width: 350px;">
                        <asp:ListItem Text="" Value=""></asp:ListItem>
                        <asp:ListItem Text="United States" Value="United States"></asp:ListItem>
                        <asp:ListItem Text="United Kingdom" Value="United Kingdom"></asp:ListItem>
                        <asp:ListItem Text="Albania" Value="Albania"></asp:ListItem>
                        <asp:ListItem Text="Algeria" Value="Algeria"></asp:ListItem>
                        <asp:ListItem Text="Angola" Value="Angola"></asp:ListItem>
                        <asp:ListItem Text="Bahamas" Value="Bahamas">Bahamas</asp:ListItem>
                        <asp:ListItem Text="Bahrain" Value="Bahrain"></asp:ListItem>
                        <asp:ListItem Text="Brazil" Value="Brazil"></asp:ListItem>
                        <asp:ListItem Text="Czech Republic" Value="Czech Republic"></asp:ListItem>
                        <asp:ListItem Text="Denmark" Value="Denmark"></asp:ListItem>
                        <asp:ListItem Text="Djibouti" Value="Djibouti"></asp:ListItem>
                        <asp:ListItem Text="Dominica" Value="Dominica"></asp:ListItem>
                        <asp:ListItem Text="Dominican Republic" Value="Dominican Republic"></asp:ListItem>

                    </asp:DropDownList><asp:Button runat="server" ID="btnSelect" Text="Get Selected" OnClick="btnSelect_Click" />

                </div>
            </div>

        </div>
        <script src="Scripts/jquery.min.js" type="text/javascript"></script>
        <script src="Scripts/chosen.jquery.js" type="text/javascript"></script>
        <script type="text/javascript"> $(".chzn-select").chosen(); $(".chzn-select-deselect").chosen({ allow_single_deselect: true }); </script>
    </form>
</body>
</html>

C#. Net Example :

    protected void btnSelect_Click(object sender, EventArgs e)
    {
        lblSelectedValue.Text = cboCountry.SelectedValue;
        
    }

Output (Default Screen) : 

(To view original image , click on image)

Output (Auto search screen) : 

(To view original image , click on image)

Output (Selected Value Screen) :  

(To view original image , click on image)

 

You can download complete running source code from above link.

Note : There are other lots of functionality of this "Chosen" plug-in. We will post those functionality in next
blogs.