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Asp.Net Interview Questions
Asp.Net 2.0/3.5 Sample Interview Questions and Answers. Interview Tips for a successful job Interview


 

Code Walkthroughs

Datagrid Formatting the Data
We are able to format the content of the datagrid cell by one of two simple methods, dependant upon whether the column is a bound column or whether it is a template column. In our example we shall format the column to have to digits after the decimal point , followed by a...

Datagrid Highlight a Row With Click Through
It is relatively easy to add alternating colours to the rows in your datagrid. However, when we move the mouse over the rows we may want to highlight this row, and possibly to add the option of a click through based on the row selected...

Add a Delete Button to a Datagrid
To add a delete button to a datagrid follows a similar process to adding an edit button. In the datagrid header...

Add an Edit Button to a Datagrid
The datagrid has a predefined editColumn for handling the editing of a datagrid. Adding this simple column definition to a datagrid adds a powerful feature. When a row is not in edit mode the column item shows the word...

Making a Datagrid Row Editable
Two of the most popular methods of editing a datagrid in asp.net are to either select the row and take the user off to a different presentation of the data, or to change the formatting of the row presented in the database with appropriate edit text boxes, checkboxes and...

Adding Tooltips to Datagrid Rows
Adding tooltips to datagrid rows is easy, assuming that you have already created the code for adding row highlighting. In this article I shall assume that you have already read the article entitled Datagrid Highlight a Row With Click Through...

Binding a Datagrid to an Access Database
This list covers the full lifecycle of a content management system, from initially creating the content, through to delivering it to end users...

Adding Data to a DropDownList
The aim of this article is to answer the question 'How do I add items to a DropDownList?' Initially as part of the declaration for the DropDownList we can also define a number of items, much in the same way as in classic ASP...

Getting Current Date Time
In classic ASP we had now() which would return the current date and time. For asp.net this no longer exists. So what should we use...

Test if File Exists
Sometimes, in order to reduce our chance of error, when working with the filesystem in ASP.NET, we need to determine wether a file exists before performing an action on it. The following short piece of code will enable us to test whether a file exists...

Using Javascript with ASP.NET Form Elements
Adding simple pieces of Javascript to an Asp.net page can be acheived by adding to the attributes of the particular imagebutton or linkbutton. if its normal ASP.Net Button then you can...

Regular Expressions
In the table below we list the characters used in .Net regular expressions, together with their meaning, But first...

Authentication in Asp.net
Forms authentication in ASP.Net is far more easier and safe than Asp 3. It is possible to place a web.config file in any directory of a web site.Therefore, we are able to make most of a web site public, whilst providing authentication on, say, one directory...

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13. CheckBoxList

FAQ Home
   13.1 How to retrieve the multiple selected items in a CheckBoxList?
   13.2 How to check if nothing is selected in a CheckBoxList without using a loop to parse through all the items?



13.1 How to retrieve the multiple selected items in a CheckBoxList?



<asp:CheckBoxList id="CheckBoxList1" runat="server">
     <asp:ListItem Value="Faq">Faq</asp:ListItem>
     <asp:ListItem Value="Tips">Tips</asp:ListItem>
     <asp:ListItem Value="Tricks">Tricks</asp:ListItem>
</asp:CheckBoxList>
<asp:Button id="btnShow" style="Z-INDEX: 101; LEFT: 40px; POSITION: absolute; TOP: 136px" runat="server"
     Text="Show"></asp:Button>



VB.NET


Private Sub btnShow_Click(sender As Object, e As System.EventArgs)
     Dim strchklist As String = ""
     Dim li As ListItem
     For Each li In CheckBoxList1.Items
          If li.Selected Then
               strchklist += li.Text + " "
          End If
     Next
     If strchklist = "" Then
          Response.Write("No item Selected")
     Else
          Response.Write(("You selected : " + strchklist))
     End If
End Sub 'btnShow_Click


C#


private void btnShow_Click(object sender, System.EventArgs e)
{
     string strchklist="";
     foreach (ListItem li in CheckBoxList1.Items )
     {
          if (li.Selected )
          {
               strchklist += li.Text + " " ;
          }
      }
     if (strchklist =="")
     {
          Response.Write ("No item Selected");
     }
     else
     {
          Response.Write ("You selected : " + strchklist);
     }
}



13.2 How to check if nothing is selected in a CheckBoxList without using a loop to parse through all the items?


You can check if CheckBoxList.SelectedIndex equals to -1 which means nothing is selected.

 
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