Generate GridView rows with value based on TextBox using C# and VB.Net in ASP.Net

Hi akhter,

Check this sample. now take its reference and correct your code.

HTML

Container Number : <asp:TextBox ID="txtcontno" runat="server"></asp:TextBox>
<div>
    Input Number of Range : <asp:TextBox ID="txtqty" runat="server"></asp:TextBox>
    <asp:Button ID="btnAdd" runat="server" Text="Add" OnClick="OnAdd" />
</div><br />
<asp:Button ID="btnSave" runat="server" Text="Save" OnClick="OnSave" /><hr />
<asp:GridView ID="gvEmployees" runat="server" AutoGenerateColumns="False">
    <Columns>
        <asp:TemplateField HeaderText="ID">
            <ItemTemplate>
                <asp:Label ID="lblBid" runat="server" Text='<%#Bind("BID")%>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="QTY">
            <ItemTemplate>
                <asp:Label ID="lblQty" runat="server" Text='<%#Bind("QTY")%>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void OnAdd(object sender, EventArgs e)
{
    int containerNo = int.Parse(txtcontno.Text.Trim());
    int quantity = int.Parse(txtqty.Text.Trim());
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[] { 
                        new DataColumn("BID", typeof(int)), 
                        new DataColumn("QTY", typeof(string))
                        });
    for (int i = 1; i <= quantity; i++)
    {
        dt.Rows.Add(i.ToString(), containerNo);
    }
    this.gvEmployees.DataSource = dt;
    this.gvEmployees.DataBind();
}

VB.Net

Protected Sub OnAdd(ByVal sender As Object, ByVal e As EventArgs)
    Dim containerNo As Integer = Integer.Parse(txtcontno.Text.Trim())
    Dim quantity As Integer = Integer.Parse(txtqty.Text.Trim())
    Dim dt As DataTable = New DataTable()
    dt.Columns.AddRange(New DataColumn() {
                         New DataColumn("BID", GetType(Integer)),
                         New DataColumn("QTY", GetType(String))
                        })
    For i As Integer = 1 To quantity
        dt.Rows.Add(i.ToString(), containerNo)
    Next
    Me.gvEmployees.DataSource = dt
    Me.gvEmployees.DataBind()
End Sub

Screenshot