TextBox inside ASP.Net GridView TextChanged event using C# and VB.Net

Hi democloud,

Showing grandTotal in footer you need set property showfooter true and get gridview value ontextchange event so refer below code..

HTML

<asp:GridView runat="server" AutoGenerateColumns="false" ID="gvEmployees" OnRowDataBound="gvEmployees_RowDataBound1"
    ShowFooter="true">
    <Columns>
        <asp:BoundField DataField="date1" HeaderText="Monday" DataFormatString="{0:MM/dd/yyyy}" />
        <asp:BoundField DataField="from_time" HeaderText="Start Time" />
        <asp:BoundField DataField="to_time" HeaderText="To Time" />
        <asp:BoundField DataField="time_per_day" HeaderText="Normal Hours" />
        <asp:TemplateField>
            <ItemTemplate>
                <asp:TextBox ID="mon1" runat="server" AutoPostBack="true" OnTextChanged="mon1_TextChanged"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Total">
            <ItemTemplate>
                <asp:Label ID="lblTotal" runat="server" />
            </ItemTemplate>
            <FooterTemplate>
                <b>Grand Total:&nbsp;</b>
                <asp:Label ID="lblGrandTotal" runat="server" />
            </FooterTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
<asp:TextBox runat="server" ID="TextBox1" />

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[] { new DataColumn("date1", typeof(DateTime)),
                        new DataColumn("from_time", typeof(DateTime)),
                        new DataColumn("to_time",typeof(DateTime)) ,
                        new DataColumn("time_per_day",typeof(double))});
        dt.Rows.Add("03/07/2019", "03/07/2019 09:30", "03/07/2019 06:30", 9);
        dt.Rows.Add("02/07/2019", "02/07/2019 09:30", "02/07/2019 06:30", 9);
        gvEmployees.DataSource = dt;
        gvEmployees.DataBind();
    }
}

double grandTotal;
protected void gvEmployees_RowDataBound1(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        double hours = double.Parse(e.Row.Cells[3].Text.Trim());
        Label total = e.Row.FindControl("lblTotal") as Label;
        total.Text = (hours).ToString();
        grandTotal += double.Parse(total.Text);
    }
    if (e.Row.RowType == DataControlRowType.Footer)
    {
        (e.Row.FindControl("lblGrandTotal") as Label).Text = grandTotal.ToString();
    }
}

protected void mon1_TextChanged(object sender, EventArgs e)
{
    GridViewRow row = (sender as TextBox).NamingContainer as GridViewRow;
    TextBox txt = (TextBox)row.FindControl("mon1");
    double count = Convert.ToDouble(txt.Text);
    TextBox1.Text = count.ToString();
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dt As DataTable = New DataTable()
        dt.Columns.AddRange(New DataColumn() {New DataColumn("date1", GetType(DateTime)), New DataColumn("from_time", GetType(DateTime)), New DataColumn("to_time", GetType(DateTime)), New DataColumn("time_per_day", GetType(Double))})
        dt.Rows.Add("03/07/2019", "03/07/2019 09:30", "03/07/2019 06:30", 9)
        dt.Rows.Add("02/07/2019", "02/07/2019 09:30", "02/07/2019 06:30", 9)
        gvEmployees.DataSource = dt
        gvEmployees.DataBind()
    End If
End Sub

Private grandTotal As Double

Protected Sub gvEmployees_RowDataBound1(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow Then
        Dim hours As Double = Double.Parse(e.Row.Cells(3).Text.Trim())
        Dim total As Label = TryCast(e.Row.FindControl("lblTotal"), Label)
        total.Text = (hours).ToString()
        grandTotal += Double.Parse(total.Text)
    End If

    If e.Row.RowType = DataControlRowType.Footer Then
            TryCast(e.Row.FindControl("lblGrandTotal"), Label).Text = grandTotal.ToString()
    End If
End Sub

Protected Sub mon1_TextChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim row As GridViewRow = TryCast((TryCast(sender, TextBox)).NamingContainer, GridViewRow)
    Dim txt As TextBox = CType(row.FindControl("mon1"), TextBox)
    Dim count As Double = Convert.ToDouble(txt.Text)
    TextBox1.Text = count.ToString()
End Sub

Screenshot