Top 10 Filter

IF I try the Mongodb version of the accepted answer: 

int n = //user-specified parameter

var topNames = collection.Find(_ => true)
                         .Project(t => t.name)
                         .Limit(n)
                         .ToList();

                         
collection is an instance of IMongoCollection and t represents the documents in the collection. I think Mongodb databases don't support a TOP keyword since they don't have a concept of ordering. 

here is the linq version of the accepted answer:

int n = //user-specified parameter

var topNames = context.Table
                    .Select(t => t.name)
                    .Take(n)
                    .ToList();

context is an instance of your Entity Framework DbContext and Table is the name of the corresponding table.
 

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        Label lblPgTotal = (Label)e.Row.FindControl("lblTotalPrice");
        dPageTotal += Decimal.Parse(lblPgTotal.Text);
    }
    if (e.Row.RowType == DataControlRowType.Footer)
    {
        if (ViewState["TotalPrice"] != null && dPageTotal != 0)
        {
            
            Label lblPageTotal = (Label)e.Row.FindControl("lblPageTotal");
            lblPageTotal.Text = dPageTotal.ToString("N2");

            Label lblGrandTotal = (Label)e.Row.FindControl("lblGrandTotal");
            lblGrandTotal.Text = ViewState["TotalPrice"].ToString();
        }
    }
}

protected void lnkPage_Click(object sender, EventArgs e)
{
    int pageIndex = int.Parse((sender as LinkButton).CommandArgument);
    this.GetCustomersPageWise(pageIndex);
}

Thank You all

Check the attached zip file, this may help you to fix your issue.
 

Hello jaya prakash,

Please refer this one,

https://www.c-sharpcorner.com/blogs/custom-page-size-and-paging-for-asp-net-grid-view

Hello

On client side use this

 
On server side use

SettingsPager.PageSize=50; 

Thanks