Auto generate ASP.Net GridView Rows based on two Date range using C# and VB.Net

Hey akhter,

Please refer below sample.

HTML

<asp:GridView runat="server" ID="gvEmployees" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="EmployeeId" HeaderText="EmployeeId" />
        <asp:BoundField DataField="Date" HeaderText="Date" />
    </Columns>
</asp:GridView>

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    DateTime date1 = Convert.ToDateTime("10/12/2018");
    DateTime date2 = Convert.ToDateTime("10/13/2018");
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[] { new DataColumn("EmployeeId", typeof(int)), new DataColumn("Date", typeof(string)) });
    for (DateTime i = date1; i <= date2; i = i.AddDays(1))
    {
        for (int j = 1; j <= 5; j++)
        {
            dt.Rows.Add(j, i.ToShortDateString());
        }
    }
    this.gvEmployees.DataSource = dt;
    this.gvEmployees.DataBind();
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim date1 As DateTime = Convert.ToDateTime("10/12/2018")
    Dim date2 As DateTime = Convert.ToDateTime("10/13/2018")
    Dim dt As DataTable = New DataTable()
    dt.Columns.AddRange(New DataColumn() {New DataColumn("EmployeeId", GetType(Integer)), New DataColumn("Date", GetType(String))})
    Dim i As DateTime = date1
    While i <= date2
        For j As Integer = 1 To 5
            dt.Rows.Add(j, i.ToShortDateString())
        Next
        i = i.AddDays(1)
    End While
    Me.gvEmployees.DataSource = dt
    Me.gvEmployees.DataBind()
End Sub

Screenshot