[Solved] CS0103: The name TextBox1 does not exist in the current context

Hi there,

I need to update a number contained within a textbox in my gridview using TextBox1_TextChanged sytax

I have tried this code, but I have this error

CS0103: The name 'TextBox1' does not exist in the current context

Thanks in advance for any help you can provide.

<asp:TemplateField HeaderText="Nr."
    ItemStyle-CssClass="ddl_Class_new"
    ItemStyle-HorizontalAlign="Center">
    <ItemTemplate>
        <asp:TextBox ID="TextBox1" 
            runat="server"
            AutoPostBack="true"
            CssClass="ddl_Class_new"
            BackColor="Yellow"
            Text='<%#(Eval("n").ToString())%>'                                 
            OnTextChanged="TextBox1_TextChanged"></asp:TextBox>
    </ItemTemplate>
</asp:TemplateField>

protected void TextBox1_TextChanged(object sender, EventArgs e)
{
    int stocked = Convert.ToInt32(TextBox1.Text);
}