Check/Uncheck Checkboxes using linkbutton header template inside gridview

Question

Hello Everyone please help me I am new to this programming language
I want to create A GRIDVIEW that will Check/Uncheck Checkboxes using linkbutton header template inside gridview..Is it posible..
Thanks here's my code

CODE BEHIND:

protected void lnkInitiator_Click(object sender, EventArgs e)
        {
            bool chkboxIsChecked = false;
           
            for (int i = 0; i < gridRevAppMatrix.Rows.Count; i++)
            {
                foreach (GridViewRow row in gridRevAppMatrix.Rows)
                {
                    string AppID = (gridRevAppMatrix.DataKeys[row.RowIndex].Values["MatrixCondition_Idx"].ToString());
                    chkboxIsChecked = false;
                    CheckBox selected = (CheckBox)gridRevAppMatrix.Rows[i].FindControl("chkInitiator");
                    if ((selected.Checked == true) && (selected != null))
                    {
                        chkboxIsChecked = false;
                        RoleSavingReg(getRole("chkInitiator"), AppID, chkboxIsChecked);
                    }
                    else
                    {
                        chkboxIsChecked = true;
                        RoleSavingReg(getRole("chkInitiator"), AppID, chkboxIsChecked);
                    }
                }
            }
        }

CLIENT SIDE:

 <asp:TemplateField>
                   <HeaderStyle BackColor="#0070C0" CssClass="TimeAssigned" ForeColor="white" Font-Italic="false" Font-Bold="true" HorizontalAlign="Center" Width="50px"/>
                   <HeaderTemplate>
                              <asp:LinkButton ID="lnkInitiator" runat="server" CssClass="LinkHeader" OnClick="lnkInitiator_Click">Initiator</asp:LinkButton>
                   </HeaderTemplate>
                   <ItemTemplate>
                         <center>
<asp:CheckBox runat="server" id="chkInitiator" OnDataBinding="chkInitiator_DataBinding" OnCheckedChanged="chkInitiator_CheckedChanged" AutoPostBack="true" /></center>
                   </ItemTemplate>
                 </asp:TemplateField>

I really appreciate your big help on this thanks