How to handle OnCheckedChanged event of a TextBox when TextBox is part of a GridView

I have a gridview (please see attached code).


I want to be able to handle the OnCheckedChanged event of the checkbox within the gridrow as followed:


protected void chk1_CheckChanged(Object sender, EventArgs e)
{
      if (ch1.Checked)
            txt1.Enabled = false;
      else if (!ch1.Checked)
            txt1.Enabled = true;
}


Is there a way to make this happen? Thx.

<asp:GridView ID="grd" runat="server" AutoGenerateColumns="False" >
 
<Columns>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <table cellspacing="0" cellpadding="0" border="0" style="height: 25px; font-size: 12px;">
                            <tr style="height: 25px">                                
                                
                                <td align="left" style="width: 70px">
                                check</td>    
                                <td align="left" style="width: 20px">
                                    Text</td>                                
                            </tr>
                        </table>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <table cellspacing="0" cellpadding="0" border="0" style="height: 25px; width: 600px">
                            <tr style="height: 25px">                               
                                
                                <td align="center"style="width: 70px">
                                    <asp:CheckBox ID="chk1" runat="server" AutoPostBack="true" CausesValidation="false" 
                                    OnCheckedChanged="chk1_CheckChanged" />
                                </td>    
                                <td align="left" style="width: 10px">
                                    <asp:TextBox ID="txt1" runat="server" MaxLength="3" /></td>                                
                            </tr>
                        </table>
                        <br />
                        
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
            <HeaderStyle Font-Size="12pt" />
        </asp:GridView>

Select allOpen in new window