Tool tip text in an ASP.NET GridView on MouseOver, to display these we needs to handle the RowDataBound event of GridView.
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.
Ex:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="cb_chkall" runat="server" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="cb_active" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lbl_msg" runat="server" text="Msg"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lbl_Name" runat="server" text='<%#Eval("Name")%>'> </asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Row Data Bound Event
Displaying tootip text or Alert message when you placed mouse on Particular columns
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
CheckBox cb;
Label lb;
cb = (CheckBox)e.Row.FindControl("cb_active");
lb = (Label)e.Row.FindControl("lbl_msg");
cb.Attributes.Add("onmouseover", cb.ToolTip = "Check to add");
lb.Attributes.Add("onmouseover", "alert('Show your Message here')");
}
}
Displaying Alert Message when you placed mouse on Particular Row
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if ( e.Row.RowType == DataControlRowType.DataRow )
{
e.Row.Attributes.Add("onmouseover", "alert('Display some message');");
}
}