如何让Gridview将变量传递给后台代码

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowCommand="GridView1_RowCommand">
    <Columns>
        <asp:TemplateField HeaderText="变量">
            <ItemTemplate>
                <asp:Label ID="lblVariable" runat="server" Text='<%# Eval("Variable") %>'></asp:Label>
            </ItemTemplate>
            <EditItemTemplate>
                <asp:TextBox ID="txtVariable" runat="server" Text='<%# Bind("Variable") %>'></asp:TextBox>
            </EditItemTemplate>
        </asp:TemplateField>
        <asp:CommandField ShowEditButton="True" />
    </Columns>
</asp:GridView>

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName == "Edit")
    {
        int rowIndex = Convert.ToInt32(e.CommandArgument);
        GridViewRow row = GridView1.Rows[rowIndex];
        Label lblVariable = (Label)row.FindControl("lblVariable");
        TextBox txtVariable = (TextBox)row.FindControl("txtVariable");
        
        // 获取变量的值
        string variable = txtVariable.Text;
        
        // 执行后续操作，如更新数据库等
    }
}