how to visible false link buttons in the gridview

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C#

In Gridview as follows


Room Course Room Course

11 Linkbtn 21 Linkbtn
12 Linkbtn 22 Linkbtn
13 Linkbtn 23 Linkbtn
14 Linkbtn 24 Linkbtn


i have one button called Hidelinkbutton. when i click that hidelinkbutton i want in Gridview all the Linkbtn to be visible false.


for that how can do using csharp.


I tried my code as follows


protected void Hidelinkbutton_Click(object sender, EventArgs e)
{

GridView row = gvClassRooms.Rows[0];
((LinkButton)row.FindControl("lnkRoom1")).Visible = false;

GridView row = gvClassRooms.Rows[1];
((LinkButton)row.FindControl("lnkRoom1")).Visible = false;


GridView row = gvClassRooms.Rows[2];
((LinkButton)row.FindControl("lnkRoom1")).Visible = false;


GridView row = gvClassRooms.Rows[3];
((LinkButton)row.FindControl("lnkRoom1")).Visible = false;

}



when i run the above code shows error as follows,

Cannot implicitly convert type 'System.Web.UI.WebControls.GridViewRow' to 'System.Web.UI.WebControls.GridView'


please help me. what is the problem in my above code.


Rgds,
Narasiman P.