ASP.NET Tips

Friday, July 26, 2013

Find and Replace Text in Text / HTML Files

public void ReplaceInFile(string filePath,string replaceText,string findText)
{
try
{
System.IO.StreamReader objReader;
objReader= new System.IO.StreamReader(filePath);
string content= objReader.ReadToEnd();
objReader.Close();
content= Regex.Replace(content,findText,replaceText);
StreamWriter writer= new StreamWriter(filePath);
writer.Write(content);
writer.Close();
}
catch(IOException iexp)
{
throw;
}

Tuesday, January 8, 2013

Execute JavaScript function from ASP.NET codebehind

Calling a JavaScript function from codebehind is quiet simple, yet it confuses a lot of developers. Here's how to do it. Declare a JavaScript function in your code as shown below:
JavaScript

<head runat="server">
    <title>Call JavaScript From CodeBehind</title>
    <script type="text/javascript">
        function alertMe() {
            alert('Hello');
        }
    </script>
</head>

In order to call it from code behind, use the following code in your Page_Load
C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!ClientScript.IsStartupScriptRegistered("alert"))
    {
        Page.ClientScript.RegisterStartupScript(this.GetType(),
            "alert", "alertMe();", true);
    }
}

Tuesday, December 4, 2012

Select DropDownList programmatically

Set by Text:

DDL.SelectedIndex = DDL.Items.IndexOf(DDL.Items.FindByText("PassedValue"));

Set by Value:

DDL.SelectedIndex = DDL.Items.IndexOf(DDL.Items.FindByValue("PassedValue"));

Friday, October 5, 2012

How to populate month name in DropDownList in ASP.NET

http://dotnetsqltips.blogspot.com/2012/01/how-to-populate-month-name-in.html

Monday, July 9, 2012

Get the ConnectionString from the Web.Config file with only one line of code (C#)

Get the ConnectionString from the Web.Config file with only one line of code (C#):

var conString = ConfigurationManager.ConnectionStrings["LocalSqlServer"];
string strConnString = conString.ConnectionString;

Tuesday, May 8, 2012

Getting All Controls On The ASP.NET Page

While working with ASP.NET, from time to time, I need to change some parameter that is common to all controls of on a page. An example of such operation might be setting ReadOnly property for all TextBox controls etc.
Below is a sample method code I use to get a flattened hierarchy of controls on a page:

public static Control[] FlattenHierachy(Control root)
{
    List<Control> list = new List<Control>();
    list.Add(root);
    if (root.HasControls())
    {
        foreach (Control control in root.Controls)
        {
            list.AddRange(FlattenHierachy(control));
        }
    }
    return list.ToArray();
}

As you can see, it is pretty simple. The method recursively traverses control hierarchy and collects each control it finds on its way to a collection which is finally returned to the caller in a form of an array.
As mentioned above we can use this method to set the ReadOnly property of all TextBox-es on the page. To do this, a code similar to the one below can be used:

private void MakeTextBoxesReadOnly()
{
    Control[] allControls = FlattenHierachy(Page);
    foreach (Control control in allControls)
    {
        TextBox textBox = control as TextBox;
        if (textBox != null)
        {
            textBox.ReadOnly = true;
        }
    }
}

Using a combination of the above outlined methods it is easy to implement a kind of ReadOnlyMode page filter. Just identify what controls need to be ReadOnly and how to make them so (RadioButton for example doesn't have a ReadOnly property). When you know how and what you want to make ReadOnly, just override Page's OnPreRender method by adding a call a MakeTextBoxesReadOnly method (or whatever method you create).
Of course all of this is possible thanks to the great ASP.NET control model which is one of the things that I really like about ASP.NET.
Source: http://vaultofthoughts.net

Thursday, March 8, 2012

a little music for relaxing moment

PhanRang Pho Thi Cua toi