ASP.NET MVC: How to get model values from separate javascript file

Problem
How to get ASP.NET MVC model values from separate javascript file?

Solution
There are many ways to get model values from separate javascript file. Here are a couple of way to do it:

1. If you are using HTML5 you can use custom data attributes

 <div id="baseTargetUrl" data-basetargeturl="<%= Url.Content("~/") %>" />  

and get custom attribute value from javascript file

 var rootUrl = location.protocol + '//' + location.host +  
 $('#baseTargetUrl').data('basetargeturl');  

2. Set javascript variable from view

 <script type="text/javascript">  
 var baseTargetUrl= <%= Url.Content("~/") %>;  
 </script>  

and use this variable from separate javascript file

3. Extend jQuery to allow own namespace to store values. Here is a great example how to do it

WinForms and C#: How to sort a ListView by column

Problem

How to sort a "WinForms.ListView" content when one of the columns are clicked

Solution

I don't remember where I found this great Sorter-class but just copy-paste it to your project as a new ListViewSorter class

public class ListViewSorter : System.Collections.IComparer
{
        public int Compare(object x, object y)
        {
            int result = 0;

            if (!(x is ListViewItem))
            {
                return result;
            }
            if (!(y is ListViewItem))
            {
                return result;
            }

            // Determine whether the type being compared is a date type.
            try
            {
                System.DateTime firstDate = DateTime.Parse(((ListViewItem)x).SubItems[ByColumn].Text);
                System.DateTime secondDate = DateTime.Parse(((ListViewItem)y).SubItems[ByColumn].Text);
                result = DateTime.Compare(firstDate, secondDate);
            }
            catch
            {        
                // Compare the two items as a string. 
                result = String.Compare(((ListViewItem)x).SubItems[ByColumn].Text, ((ListViewItem)y).SubItems[ByColumn].Text);
            }

            // Determine whether the sort order is descending. 
            if (((ListViewItem)x).ListView.Sorting == SortOrder.Descending)
            {
                // Invert the value returned by compare. 
                result *= -1;
            }

            LastSort = ByColumn;
            return result;
        }

        public int ByColumn
        {
            get { return Column; }
            set { Column = value; }
        }
        int Column = 0;

        public int LastSort
        {
            get { return LastColumn; }
            set { LastColumn = value; }
        }
        int LastColumn = 0;
}

After your class is ready you must declare a sorter object in the form:

private ListViewSorter listSorter = new ListViewSorter();

and create a new event for ListView ColumnClick to handle sorting

private void listMyList_ColumnClick(object sender, ColumnClickEventArgs e)
{
        listMyList.ListViewItemSorter = listSorter;
        if (listSorter.LastSort == e.Column)
        {
            // Change sort order for current column
            if (listMyList.Sorting == SortOrder.Ascending)
            {
                listMyList.Sorting = SortOrder.Descending;
            }
            else
            {
                listMyList.Sorting = SortOrder.Ascending;
            }
        }
        else
        {
            listMyList.Sorting = SortOrder.Descending;
        }
        listSorter.ByColumn = e.Column;
        listMyList.Sort();
}

ASP.NET: How to pass value back from user control to the page with events

Problem
This is simple tutorial how to pass a value back from user control to the page with event. In this example textbox value is passed back to the label on default page

Solution
After creating a new web site with default page create a simple user control called InputBox. Inputbox should have one TextBox and two buttons

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="InputBox.ascx.cs" Inherits="Testi.InputBox" %>
<table>
    <tr>
        <td colspan="2">
            <asp:Label ID="lblUserInput" runat="server" Text="User input:"></asp:Label>
        </td>
    </tr>
    <tr>
        <td colspan="2">
            <asp:TextBox ID="txtUserInput" runat="server"></asp:TextBox>
        </td>
    </tr>
    <tr>
        <td>
            <asp:Button ID="btnOk" runat="server" Text="OK" onclick="btnOk_Click" />
        </td>
        <td>
            <asp:Button ID="btnCancel" runat="server" Text="Cancel" 
                onclick="btnCancel_Click" />
        </td>
    </tr>
</table>

Open user control code-behind and create a new EventArgs class

public class InputEventArgs : EventArgs
{
    public string UserInput{ get; set; }
}

Then add two events to the user control which uses InputEventArgs

    public event EventHandler<InputEventArgs> OKClicked;
    public event EventHandler<InputEventArgs> CancelClicked;

Add following code to the OK and Cancel -button event handlers to fill InputEventArgs:

        protected void btnOk_Click(object sender, EventArgs e)
        {
            // Create a new event argument when OK is clicked
            if (OKClicked != null)
            {
                EventHandler<InputEventArgs> tmp = OKClicked;
                if (tmp != null)
                {
                    // Take value from textbox 
                    tmp(this, new InputEventArgs() { UserInput = txtUserInput.Text });
                }
            }
        }

        protected void btnCancel_Click(object sender, EventArgs e)
        {
            // Create a new event argument when Cancel is clicked
            if (CancelClicked != null)
            {
                EventHandler<InputEventArgs> tmp = CancelClicked;
                if (tmp != null)
                {
                    tmp(this, new InputEventArgs() { UserInput = null });
                }
            }
        }

Now you can open your default.aspx page and register user control

<%@ Register TagPrefix="Test" TagName="InputBox" Src="InputBox.ascx" %>

Add the user control and result label inside form

        <table>
            <tr>
                <td>
                    <b>For example you can place this user control inside modal confirmation...</b>
                </td>
            </tr>
            <tr>
                <td>
                    <Test:InputBox ID="inputBox" runat="server" OnOKClicked="InputBox_OKClicked" 

OnCancelClicked="InputBox_CancelClicked" />
                </td>
            </tr>
            <tr>
                <td>
                    <b>Display input value from user control:</b>
                </td>
            </tr>
            <tr>
                <td>
                    <asp:Label ID="lblInputBoxResult" runat="server" Text=""></asp:Label>
                </td>
            </tr>
        </table>

Then open default page code-behind and create two event handlers to handle clicks from user control

        protected void InputBox_OKClicked(object sender, InputEventArgs e)
        {
            lblInputBoxResult.Text = e.UserInput;
        }

        protected void InputBox_CancelClicked(object sender, InputEventArgs e)
        {
            lblInputBoxResult.Text = "User clicked cancel";
        }

Now you can run and test if value from user control is passed to the event handler at default page...

.NET Framework 4: Unable to cast object of type 'system.string' to type

Problem

For example you are binding pricelist-objects to a combobox in WinForms application like this

cmbPricelist.DataSource = BL.GetPricelists();
cmbPricelist.ValueMember = "PricelistCode";
cmbPricelist.DisplayMember = "PricelistName";

and later you trying to get selected item from combobox like this

Pricelist p = (Pricelist)cmbPricelist.SelectedValue;

you might get an error "Unable to cast object of type 'system.string' to type..."

Solution

If you are using .NET Framework 4 Client profile ComboBox.SelectedValue method returns object (in this example Pricelist).

But if you are using .NET Framework 4 Full profile ComboBox.SelectedValue method returns ValueMember as String

ASP.NET: Prevent button double-click

Problem

How to prevent button double-click on ASP.NET page

Solution

Add following code to Page_load. This code prevents button double-click on client-side but still executes code at server-side:

VB.Net

btnSave.Attributes.Add("onclick", " this.disabled = true; " + ClientScript.GetPostBackEventReference(btnSave, Nothing) + ";")

C#

btnSave.Attributes.Add("onclick", " this.disabled = true; " + ClientScript.GetPostBackEventReference(btnSave, null) + ";");

CRM Adapter 4.0 installation to Biztalk Server 2010

Problem

You might receive an error "Microsoft Biztalk Server 2006 is not installed. You must install Microsoft Biztalk Server 2006. Then, try running Setup Again" when running CRM Adapter 4.0 setup

Solution

Edit ProductName value at HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\BizTalk Server\3.0 to Microsoft BizTalk Server 2006 and then run setup again. After setup is complete you can change ProductName back to Microsoft BizTalk Server 2010

There was a failure executing the receive pipeline: Verify the schema for this document specification is deployed and is in the Global Assembly Cache

Problem

You might receive this error "There was a failure executing the receive pipeline: Verify the schema for this document specification is deployed and is in the Global Assembly Cache" in Biztalk 2010 while trying to submit a message to the receive location which is published with the WCF Service Publishing Wizard.

Solution

By default WCF service is running inside AppPool which is configured to use .Net Framework 2.0. Change WCF service AppPool to one which uses .Net Framework 4.0