Determine Gridview Cell Value

<asp:GridView ID="gvEquipment" runat="server" AutoGenerateColumns="False" EnableModelValidation="True"
     Height="150px" Style="margin-right: 1px">
    <Columns>
        <asp:TemplateField HeaderText="Equipment ID" Visible="False">
            <ItemTemplate>
                <asp:TextBox ID="txtEquipID" runat="server" ReadOnly="True" Text='<%# DataBinder.Eval(Container.DataItem, "Equip ID") %>'
                    Width="<%# 30 %>"></asp:TextBox>
            </ItemTemplate>
            <HeaderStyle Width="125px" />
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Total #">
            <ItemTemplate>
                <asp:TextBox ID="txtEquipCnt" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Total #") %>'
                    Width="<%# 25 %>"
                    AutoPostBack="True" ontextchanged="txtEquipCnt_TextChanged"></asp:TextBox>
            </ItemTemplate>
            <HeaderStyle Width="40px" />
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Equipment">
            <ItemTemplate>
                <asp:TextBox ID="txtEquipDesc" runat="server" ReadOnly="True" Text='<%# DataBinder.Eval(Container.DataItem, "EquipDesc") %>'
                    Width="<%# 110 %>"></asp:TextBox>
            </ItemTemplate>
            <HeaderStyle Width="130px" />
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Cost/Hour">
            <ItemTemplate>
                <asp:TextBox ID="txtEquipCharge" runat="server" ReadOnly="True" Text='<%#String.Format("{0, 0:N2}", DataBinder.Eval(Container.DataItem, "CostPerHour")) %>'
                    Width="<%# 55 %>" ></asp:TextBox>
            </ItemTemplate>
            <HeaderStyle Width="40px" />
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Total Cost">
            <ItemTemplate>
                <asp:TextBox ID="txtEquipCost" runat="server" ReadOnly="True" Text='<%# String.Format("{0:0,0.00}", DataBinder.Eval(Container.DataItem, "EquipCost")) %>'
                    Width="<%# 75 %>"></asp:TextBox>
            </ItemTemplate>
            <HeaderStyle Width="100px" />
        </asp:TemplateField>
    </Columns>
</asp:GridView>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        EquipCost();  //Loads gridview from Datatable.

    }
}