Grey screen show

I don't know why i see a grey page after this block and i didn't see label '' it was successful", could you say me?

  1. What is in your Txt_first.Text ?
  2. The "&LastName=" should be "?LastName="

thanks for your attention
1- is ?firstname that i delete with link at end of https
my problem solved when i go to designer and improve some arrangment.

that was for listpeacker after this block


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