How to fix error "Unable to cast object of type 'System.Web.UI.DataBoundLiteralControl' to type 'System.Web.UI.WebControls.TextBox'"

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C#

ASP.NET

SQL-Server-2008R2

am getting an error while updating my grid view, Unable to cast object of type 'System.Web.UI.DataBoundLiteralControl' to type 'System.Web.UI.WebControls.TextBox'"



This is my aspx code

<div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" AllowPaging="true"
            PageSize="10" Font-Names="Arial" Font-Size="11pt" AlternatingRowStyle-BackColor="#C2D69B"
            HeaderStyle-BackColor="green" OnPageIndexChanging="OnPaging">
            <Columns>
                <asp:BoundField DataField="Name" HeaderText="Name" />
                <asp:BoundField DataField="InvestmentType" HeaderText="Investment Type" />
                <asp:TemplateField>
                    <HeaderTemplate>
                        Amount:
                        <asp:DropDownList ID="ddlCountry" runat="server" OnSelectedIndexChanged="CountryChanged"
                            AutoPostBack="true" AppendDataBoundItems="true">
                            <asp:ListItem Text="ALL" Value="ALL"></asp:ListItem>
                            <asp:ListItem Text="Top 10" Value="10"></asp:ListItem>
                        </asp:DropDownList>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <%# Eval("Amount")%>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="MonthlyPay" HeaderText="Monthly Pay" />
  <asp:BoundField HeaderStyle-Width="125px" DataField="NumberOfMonths" HeaderText="Months" />
                   </Columns>
        </asp:GridView>
    </div><pre lang="HTML"><pre lang="HTML"><pre lang="HTML">

for searching records by using dropdownlist i have given that templatefield

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
  int userid = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value.ToString());
        GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
        Label lblID = (Label)row.FindControl("lblID");
        TextBox textName = (TextBox)row.Cells[1].Controls[0];
        TextBox textInvestmentType = (TextBox)row.Cells[2].Controls[0];
        TextBox textAmount = (TextBox)row.Cells[3].Controls[0];
        TextBox textMonthlyPay = (TextBox)row.Cells[4].Controls[0];

am getting that error at textamount

Thanking you