populate data from database in a textbox after press tab key

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Dear All,
i want to populate data from database in a text box after press tab key.
the thing is like that....
where i am having 3 textboxes.In textbox 1 i am inserting 2, and In textbox 2 i am inserting 2. And I want do addition.Now i have a procedure where i am doing addition.and i want to fetch addition value into the textbox 3 after pressing tabkey.

if someone know please share the knowledge.
thanks avi....

Posted 20-Jun-12 17:57pm

avijit1112009

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Sunny_Kumar_ 21-Jun-12 0:05am

please clarify what actually you want to do. You want the addition of two text box's value in third one or you want to fetch something from database. what have you tried yet to achieve this??

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bhagirathimfs · Accepted Answer · 2012-06-20T18:17:00

In the aspx page write

ASP.NET

<asp:textbox id="TextBox1" runat="server" autopostback="true" ontextchanged="TextBox1_TextChanged" xmlns:asp="#unknown" />
<asp:textbox id="TextBox2" runat="server" autopostback="true" ontextchanged="TextBox1_TextChanged" xmlns:asp="#unknown" />
<asp:textbox id="TextBox3" runat="server" xmlns:asp="#unknown" />

In Code behind page

C#

protected void TextBox1_TextChanged(object sender, EventArgs e)
{
   if(TextBox1.Text.Length != 0 && TextBox2.Text.Length != 0)
   {
        TextBox3.Text = (Convert.ToInt32(TextBox1.Text) + Convert.ToInt32(TextBox2.Text)).ToString();
   } 
}

Try above code
I have added a event name OnTextChanged which will fire when u change the text of the textbox.