how to control a gridview by a button click outside the grid

Yes.

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Yes, you can control gridview on button click.
For Example, you want to show data in gridview on button click,
so on button click event bind the gridview with data.
Suppose, you want to hide the gridview on click of another button then
set visible=false for that gridview.

On the button click page is posted to the server and we can make
changes to the gridview.

Regards
SumanK

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<asp:BoundField DataField="Notes" HeaderText="Notes" Visible="False" 

SortExpression="Notes" /> 

<asp:BoundField DataField="Notes" HeaderText="Notes" Visible="False" 

SortExpression="Notes" /> 

<asp:ButtonField ButtonType="Image" ImageUrl="~/Images/Imgs.jpg" 

Text="Button" /> 

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protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e) 

{ 

GridView1.Columns[2].Visible = true; 

GridView1.Columns[3].Visible = true; 

}

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