Sending Email in ASP.Net from Windows XP

Thursday, August 28, 2008
Now a days many web application has a requirement of send email. Using ASP.Net we can send emails, but when ever we are developing in WindowsXP environment, It doesnt allows us to send the email. It need some configuration so that we can send Email in WindowsXP with ASP.Net. Here are Steps for configuration..

Step 1: Open IIS, Stop the "Default SMTP Virtual Server" here is screen shot

Step 2: Open Properties of "Default SMTP Virtual Server" in that one, Select "Access" tab.

Step 3: click on "Relay" button. It will open a "Relay Restriction" window. In this window select a radio button with text as "Only the list below".

Step 4: Then click on "Add" button. which allow to enter an IP Address. In that enter local IP Address as Then click "ok" button to close Access tab and propertie window. here is the screen shot:

Step 5: Restart the "Default SMTP Mail Server".
with this 5 steps we can configure IIS. Now when you send Email, it will be sent.

Gridview Cool Tips & Tricks

Wednesday, August 27, 2008
Pop-up a Confirmation box before Deleting a row in GridView
Add a template field and drop a button in it, using which the user will delete the record. In the OnClientClick event, call the confirm() function as mentioned below:

CommandName="Delete" OnClientClick="return confirm('Are you sure you want to delete the record?');" />

Display details of the Row selected in the GridView
Assuming you have a button called ‘Select’ in your GridView with CommandName ‘Select’, to find out the row clicked and display the row’s details, use this code:
private void GridView1_RowCommand(Object sender,
GridViewCommandEventArgs e)
if (e.CommandName == "Select")
int idx = Convert.ToInt32(e.CommandArgument);
GridViewRow selrow = GridView1.Rows[idx];
string fstCell = selrow.Cells[0].Text;
string scndCell = selrow.Cells[1].Text;
// and so on
// Thanks to Mark Rae (MVP) for pointing the typo. Earlier it was Cells[1] and Cells [2]

Retrieve Details of the Row being Modified in GridView
void GridView1_RowUpdated(Object sender, GridViewUpdatedEventArgs e)
// Retrieve the row being edited.
int index = GridView1.EditIndex;
GridViewRow row = GridView1.Rows[index];

// Retrieve the value of the first cell
lblMsg.Text = "Updated record " + row.Cells[1].Text;

Retrieve Details of the Row being Deleted in GridView
The ID of the row being deleted must be in the GridView.DataKeyNames collection.
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
int ID = (int)GridView1.DataKeys[e.RowIndex].Value;
// Query the database and get the values based on the ID
Cancelling Update and Delete in a GridView
RowUpdating - Occurs when a row's Update button is clicked, but before the GridView control updates the row.
RowDeleting – Occurs when a row's Delete button is clicked, but before the GridView control deletes the row.
protected void gvDetail_RowUpdating(object sender, GridViewUpdateEventArgs e)
e.Cancel = true;
void GridView1_RowDeleting(Object sender, GridViewDeleteEventArgs e)
// Check for a condition and cancel the delete
// There should be atleast one row left in the GridView
if (GridView1.Rows.Count <= 1)
e.Cancel = true;

Enable Disable Controls inside a GridView
There are at times when you have to disable controls on some rows, when a certain condition is satisfied. In this snippet, we will see how to disable editing for rows that have the CategoryName as ‘Confections’. Use the following code:
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
if (e.Row.RowType == DataControlRowType.DataRow)
if (e.Row.DataItem != null)
Label lblControl = (Label)e.Row.Cells[2].FindControl("lblCategoryName");

if(lblControl.Text == "Confections")
e.Row.Cells[0].Enabled = false;

How to Add a Row Number to the Gridview
There are a couple of ways to do this. However I will share a very handy tip that was shared by XIII in the forums.
Just add the following tags to your section of your GridView <%# Container.DataItemIndex + 1 %>
How to programmatically hide a column in the GridView
There are two conditions to be checked in the Page_Load to hide a columns in the GridView, let us say the 3rd column:
If ‘AutoGenerateColumns’ = True on the GridView
GridView1.HeaderRow.Cells[2].Visible = false;
foreach (GridViewRow gvr in GridView1.Rows)
gvr.Cells[2].Visible = false;
GridView1.HeaderRow.Cells(2).Visible = False
For Each gvr As GridViewRow In GridView1.Rows
gvr.Cells(2).Visible = False
Next gvr
If ‘AutoGenerateColumns’ = False on the GridView
GridView1.Columns[2].Visible = false;
GridView1.Columns(2).Visible = False

Displaying Empty Data in a GridView
When there are no results returned from the GridView control’s data source, the short and simple way of displaying a message to the user, is to use the GridView’s EmptyDataText property.
DataSourceID="SqlDataSource1" EmptyDataText="No data available"
ShowFooter="true" AllowPaging="True" AllowSorting="True"
PageSize="5" OnRowDataBound="GridView1_RowDataBound">
Note: You can also add style to the EmptyDataText by using the
EmptyDataRowStyle property.
Displaying an Image in case of Empty Data in a GridView
As an alternative to using the EmptyDataText property, if you need to display an image or any HTML/ASP.NET control, you can use the EmptyDataTemplate. In this snippet below, we are using the image control in the to display an image.
DataSourceID="SqlDataSource1" ShowFooter="true" AllowPaging="True" AllowSorting="True"
PageSize="5" OnRowDataBound="GridView1_RowDataBound">

AlternateText="No data found"

Change the color of a GridView Row based on some condition
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
if (e.Row.DataItem != null)
DataRowView drv = (DataRowView)e.Row.DataItem;
string catName = Convert.ToString(drv["CategoryName"]);
if (catName.Trim() == "Confections")
e.Row.BackColor = System.Drawing.Color.LightBlue;
How to create an Image Command Field Column and add to the GridView at runtime
if (!Page.IsPostBack)
CommandField cmdField = new CommandField();
cmdField.ButtonType = ButtonType.Image;
cmdField.SelectImageUrl = "~/Images/Home_Np1.GIF";
cmdField.ShowSelectButton = true;
cmdField.HeaderText = "Select";

How to loop through all the rows in all the pages of a GridView
One simple way to loop through all the rows in all the pages of a GridView is to access its DataSource. In this example, we will loop through the SQLDataSource to retrieve all the rows in a GridView and access its cell value. You can modify the logic depending on the type of controls you have added to the GridView
protected void Button1_Click(object sender, EventArgs e)
DataSourceSelectArguments dsaArgs = new DataSourceSelectArguments();
DataView view = (DataView)SqlDataSource1.Select(dsaArgs);
DataTable dt = view.ToTable();
for (int i = 0; i < dt.Rows.Count; i++)
for (int j = 0; j < dt.Columns.Count; j++)
string s = dt.Rows[i][j].ToString();

Implementing Google Suggestions using Ajax in ASP.Net 2.0

Tuesday, August 19, 2008
  • Using Ajax AutoComplete Extender we can Implement google suggestions like Applications.

  • This functionality is very simple, just we have to communicate with Webservice. Where we write the logic retrieve information from the database

  • To Webservice method we have to pass "prefixText" as parameter.

  • To Satrt this Application First we have to take a TextBox and make the TextBox "AutoComplete: option as "off". Ex:
    asp:TextBox ID="txtemp" runat="server" autocomplete="off".

  • Then take a "AutoCompleteExtender" For this use fallowing Properties. Ex:

  • TargetControlID="txtemp"

  • ServicePath="AutoCom.asmx"

  • ServiceMethod="GetEmpnames"

  • MinimumPrefixLength="1"

  • CompletionInterval="1000"

  • EnableCaching="true"

  • Thts it..for Presentation side.

  • Now create a Webservice, with name "AutoCom.asmx". In that one create a method as "GetEmpnames".

  • In this method we have to write the data access logic. here I used Sql Server as Database. Here is my code:

  • public string[] GetEmpnames(string prefixText) {

  • Open connection

  • SqlCommand cmd = new SqlCommand("select EmpName from Tbl_Emp where Empname like '" + prefixText + "%'", con);

  • SqlDataReader dr; dr = cmd.ExecuteReader();

  • List items = new List();

  • while (dr.Read())

  • {

  • items.Add(dr[0].ToString());

  • }

  • return items.ToArray();

  • }

  • Here is the Screenshot:

    Download Code