Display Message On MouseOver In an ASP.NET GridView

To display a message in an ASP.NET GridView on MouseOver, handle the RowDataBound event. As given in MSDN,

The RowDataBound event is raised when a data row (represented by a GridViewRow object) is bound to data in the GridView control. This enables you to provide an event-handling method that performs a custom routine, such as modifying the values of the data bound to the row, whenever this event occurs.

    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"

        SelectCommand="SELECT [CustomerID], [CompanyName], [ContactName], [Address], [City] FROM [Customers]">

    </asp:SqlDataSource>

 

    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="CustomerID"

            DataSourceID="SqlDataSource1" AllowPaging="True" AllowSorting="True"

            OnRowDataBound="GridView1_RowDataBound">

            <Columns>                          

                <asp:BoundField DataField="CustomerID" HeaderText="CustomerID" ReadOnly="True" SortExpression="CustomerID" />

                <asp:BoundField DataField="CompanyName" HeaderText="CompanyName" SortExpression="CompanyName" />

                <asp:BoundField DataField="ContactName" HeaderText="ContactName" SortExpression="ContactName" />

                <asp:BoundField DataField="Address" HeaderText="Address" SortExpression="Address" />

                <asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />

            </Columns>

     </asp:GridView>

C#

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

{

 if ( e.Row.RowType == DataControlRowType.DataRow )

 {

  e.Row.Attributes.Add("onmouseover", "alert('Display some message');");

 }

}

VB.NET

    Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)

        If e.Row.RowType = DataControlRowType.DataRow Then

            e.Row.Attributes.Add("onmouseover", "alert('Display some message');")

        End If

    End Sub