Asp.net : Display tooltip in Gridview column on mouseover

In this article I am going to explain how to display tooltip in Gridview column on mouseover in asp.net. 

Description:
I am displaying employee’s information in Gridview and want to display each column data when placed mouse on column. We have 2 options 1st write  code on RowDataBound event of Gridview and 2nd use the label control’s tooltip property.

Implementation:
Method 1:

Complete source of webform

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title> Show tooltip on entire Gridview row hover </title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
            <Columns>
                <asp:BoundField HeaderText="Name" DataField="Name">
                <HeaderStyle HorizontalAlign="Left" />
                </asp:BoundField>
                <asp:BoundField DataField="Phone" HeaderText="Phone" >
                <HeaderStyle HorizontalAlign="Left" />
                </asp:BoundField>
                <asp:BoundField DataField="Salary" HeaderText="Salary" >
                  <HeaderStyle HorizontalAlign="Left" />
                </asp:BoundField>
                  <asp:BoundField DataField="Department" HeaderText="Department">
                <HeaderStyle HorizontalAlign="Left" />
                </asp:BoundField>
                <asp:BoundField DataField="EmailId" HeaderText="Email">
                <HeaderStyle HorizontalAlign="Left" />
                </asp:BoundField>
                <asp:ImageField DataImageUrlField="ImagePath" ControlStyle-Height="100" ControlStyle-Width="100">
<ControlStyle Height="100px" Width="100px"></ControlStyle>
                </asp:ImageField>
            </Columns>
        </asp:GridView>
    </div>
    </form>  
</body>
</html>

Add namespaces
C# Code
using System.Configuration;
using System.Data.SqlClient;
using System.Data;

VB.net Code
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration

Bind Gridview
Create a method to bind Gridview and call it on page load.

C# Code
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connection"].ToString());
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Fillgrid();
        }
    }
    public void Fillgrid()
    {
        try
        {
            SqlDataAdapter adp = new SqlDataAdapter("Select * from Employees", con);
            DataTable dt = new DataTable();
            adp.Fill(dt);
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
        catch(Exception ex){}
    }

VB.net Code
    Private con As New SqlConnection(ConfigurationManager.ConnectionStrings("connection").ToString())
    Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
        If Not IsPostBack Then
            Fillgrid()
        End If
    End Sub
    Public Sub Fillgrid()
        Try
            Dim adp As New SqlDataAdapter("Select * from Employees", con)
            Dim dt As New DataTable()
            adp.Fill(dt)
            GridView1.DataSource = dt
            GridView1.DataBind()
        Catch ex As Exception
        End Try
    End Sub

Display Tooltip on mouse hover
On Rowdatabound event write the below given code.

C# Code
    protected void GridView1_RowDataBound1(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            foreach (TableCell cell in e.Row.Cells)
            {
                cell.Attributes.Add("Mouseover", cell.Text);
            }
        } 
        //for (int i = 0; i < e.Row.Cells.Count; i++)
        //{
        //    e.Row.Cells[i].ToolTip = e.Row.Cells[i].Text;
        //}      
    }

VB.net Code
Protected Sub GridView1_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles GridView1.RowDataBound
        If e.Row.RowType = DataControlRowType.DataRow Then
            For Each cell As TableCell In e.Row.Cells
                cell.Attributes.Add("Mouseover", cell.Text)
            Next
        End If
        'for (int i = 0; i < e.Row.Cells.Count; i++)
        '{
        '    e.Row.Cells[i].ToolTip = e.Row.Cells[i].Text;
        '}
    End Sub


Method 2 :
Use label control to display the data. Use as shown below:

<asp:TemplateField>
                    <ItemTemplate>
                        <asp:Label ID="lblname" runat="server" Text='<%#Eval("Name") %>' ToolTip='<%#Eval("Name") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>

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