I try to match value from gridview

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C#

Example :
//cs

Control control = null;

control = GridView1.Controls[0].Controls[0];
string proCode = Convert.ToString((control.FindControl("lblProductCode") as Label).Text);
Label1.Text = proCode;

//aspx
<asp:TemplateField HeaderText = "Product Code">
<itemtemplate>
<asp:Label ID="lblProductCode" runat="server" Text='<%#Eval("productCode") %>'>



<asp:Label ID="Label1" runat="server" Text="Label">

Result:
Object reference not set to an instance of an object.
how to match the current row value?