Check/Uncheck Checkboxes using linkbutton header template inside gridview

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:

 
                  
                  
                              Initiator
                  
                  
                        

                  
                

I really appreciate your big help on this thanks