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cm.Command.Parameters.Add("@FeedID", SqlDbType.SmallInt).Value = GridView1.Rows[GridView1.SelectedIndex].Cells[0].Text;

This Exception is thrown when you try to access an item in a collection by its index, but the index does not exist.
For example, you have the following collection:
c = {"Zero", "One", "Two", "Three"}

Now imagine you want "Zero", you'd say c[0], which is fine.
Now say you want "Four", you'd say c[4], but there is no "Four"! At this time the Exception would be thrown.

In this case your grid either has less rows than GridView1.SelectedIndex or it has no Cells.
It probably has Cells, so I suspect GridView1.SelectedIndex is not returning what you expect :)

For more information on the IndexOutOfRangeException see the MSDN page for IndexOutOfRangeException[^].
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if there is no selection SelectedIndex will have -1, add validation for that case
  cm.Command.Parameters.Add("@FeedID", SqlDbType.SmallInt).Value = GridView1.Rows[GridView1.SelectedIndex].Cells[0].Text;
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Check your event handler: you will get an event when no item is selected (particularly when you load the control) and the SelectedIndex will be -1 in that case to indicate it.

You should add a test to check before you try and use the index!
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