how to show html input fields in update panel
<p>i am very new to Asp.Net.
I have Dashboard on the left side that contains different buttons and have update Panel on the right side.
<strong>i have a seperate page (i.e index.aspx) which contains some Html input tags.</strong></p>

<p>What i want is to <strong>show **index.aspx</strong> in the Update Panel** whenever i click on(any one) button i.e <strong>(Messages)</strong> from the dashboard.</p>

<p>This highlighted area will be filled by updatepanel.
PS: Correct me if i am wrong because i am new in Asp.Net, Thanks
<a href="https://i.stack.imgur.com/WHbNZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WHbNZ.png" alt="enter image description here"></a></p>