[Solved] GridView DataKey Name Error: Index was out of range. Must be non-negative and less than the size of the collection

When i am deleting row from gridview ,then below error is coming

Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

                <asp:GridView ID="gvtrans" runat="server" AllowSorting="True" AutoGenerateColumns="False" BackColor="White" BorderColor="#E7E7FF" 
                    BorderStyle="None" BorderWidth="1px" CellPadding="3" CssClass="active right" GridLines="Horizontal" itemstyle-wrap="True" 
                    OnRowDataBound="gvtrans_RowDataBound" ShowFooter="True" ShowHeaderWhenEmpty="True" Style="margin-top: 0px" Width="667px" Height="86px" 
                    OnRowDeleting="gvtrans_RowDeleting">
                    <AlternatingRowStyle BackColor="#F7F7F7" CssClass="altrowstyle" />
                    <FooterStyle BackColor="#B5C7DE" ForeColor="#4A3C8C" />
                    <HeaderStyle BackColor="#4A3C8C" CssClass="headerstyle" Font-Bold="True" ForeColor="#F7F7F7" />
                    <PagerStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" HorizontalAlign="Right" />
                    <RowStyle BackColor="#E7E7FF" CssClass="rowstyle" ForeColor="#4A3C8C" />
                    <Columns>
                        <asp:BoundField DataField="RowNumber" HeaderText="S.NO" />
                        <asp:TemplateField HeaderText="Code" >
                            <ItemTemplate>
                                <asp:TextBox ID="txtcode" runat="server"   Width="40px"></asp:TextBox>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Bank">
                            <ItemTemplate>
                                <asp:Label ID="lbbank" runat="server" />
                                <asp:DropDownList ID="ddlbank" runat="server" AutoPostBack="true" OnTextChanged="ddlbank_TextChanged" CssClass="form-control js-example-placeholder-single" Height="85px"  ToolTip="Select " Width="150px">
                                </asp:DropDownList>
                            </ItemTemplate>
                        </asp:TemplateField>
                         <asp:TemplateField HeaderText="Loc_ID"  >
                            <ItemTemplate>
                                <asp:TextBox ID="txtbank_id"  runat="server" Width="50px"></asp:TextBox>
                            </ItemTemplate>
                        </asp:TemplateField>
                             <asp:TemplateField HeaderText="Location">
                            <ItemTemplate>
                                <asp:Label ID="lbloc" runat="server" Visible="false" />
                                <asp:DropDownList ID="ddloc" runat="server" AutoPostBack="true" OnTextChanged="ddloc_TextChanged"  CssClass="form-control js-example-placeholder-single" Height="85px"  ToolTip="Select " Width="150px">
                                </asp:DropDownList>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Cheque_No">
                            <ItemTemplate>
                                <asp:TextBox ID="txtChqno" runat="server" Width="130px"></asp:TextBox>
                            </ItemTemplate>
                       
                        </asp:TemplateField>
                            <asp:TemplateField HeaderText="Date">
                            <ItemTemplate>
                                <asp:TextBox ID="txtDate" runat="server" TextMode="Date" Width="130px"></asp:TextBox>
                            </ItemTemplate>
                       
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Amount">
                            <ItemTemplate>
                                <asp:TextBox ID="txtamount" runat="server" AutoPostBack="true" Text="0" OnTextChanged="txtamount_TextChanged" Width="130px"></asp:TextBox>
                            </ItemTemplate>
                        <FooterTemplate>
                                    <asp:Label ID="lblTotal" runat="server"></asp:Label>
                                </FooterTemplate>
                        </asp:TemplateField>
                                            <asp:CommandField ShowDeleteButton="True" ButtonType="Button" />

                    </Columns>
                    <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="#F7F7F7" />
                    <SortedAscendingCellStyle BackColor="#F4F4FD" />
                    <SortedAscendingHeaderStyle BackColor="#5A4C9D" />
                    <SortedDescendingCellStyle BackColor="#D8D8F0" />
                    <SortedDescendingHeaderStyle BackColor="#3E3277" />
                </asp:GridView>

C#

        protected void gvtrans_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
            string index = gvtrans.DataKeys[e.RowIndex].Values[1].ToString();
            DataTable dt = ViewState["CurrentTable"] as DataTable;
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                if (dt.Rows[i]["Index"].ToString() == index)
                {
                    dt.Rows.Remove(dt.Rows[i]);
                    ViewState["CurrentTable"] = dt;
                    gvtrans.DataSource = dt;
                    gvtrans.DataBind();
                }
            }
        }