enter data in txtbox to populate a gridview

I need to create a lookup screen and I am drawing a blank as to how to approach this. I have a label and textbox for them to enter the ID number in with a submit button. Once the submit button is clicked I want the ID from the text box as a parameter to populate a gridview. However, I am not sure how to approach this. Can someone give me a sample as to how this can be done? ( I do know how to put them in session and pass that to another page, However I am looking for the grid to populate on the same page as the textbox)

 
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