change datalist pagination style

I have tested it by retrieving only one row from the table.

I have changed my Stored Procedure like this

ALTER PROCEDURE [dbo].[GetCustomersPageWise]
      @PageIndex INT = 1
      ,@PageSize INT = 10
      ,@RecordCount INT OUTPUT
AS
BEGIN
      SET NOCOUNT ON;
      SELECT ROW_NUMBER() OVER
      (
            ORDER BY [CustomerID] ASC
      )AS RowNumber
      ,[CustomerID]
      ,[CompanyName]
      ,[ContactName]
     INTO #Results
      FROM [Customers]
     
      SELECT @RecordCount = 1
     -- FROM #Results
           
      SELECT Top 1 * FROM #Results
      WHERE RowNumber BETWEEN(@PageIndex -1) * @PageSize + 1 AND(((@PageIndex -1) * @PageSize + 1) + @PageSize) - 1
     
      DROP TABLE #Results
END

C#

 private void PopulatePager(int recordCount, int currentPage)
    {

        double dblPageCount = (double)((decimal)recordCount / (decimal)PageSize);
        int pageCount = (int)Math.Ceiling(dblPageCount);
        List<PagerPage> pages = new List<PagerPage>();
        if (pageCount > 0)
        {

            pages.Add(new PagerPage("اولین", "1", currentPage > 1, "button"));
            if (currentPage == 1)
            {
                pages.Add(new PagerPage("قبلی", (currentPage).ToString(), currentPage > 1, "button"));
            }
            if (currentPage > 1)
            {
                pages.Add(new PagerPage("قبلی", (currentPage - 1).ToString(), currentPage > 1, "button"));
            }
            if (pageCount < 4)
            {
                for (int i = 1; i <= pageCount; i++)
                {
                    pages.Add(new PagerPage(i.ToString(), i.ToString(), i != currentPage));
                }
            }
            else if (currentPage < 4)
            {
                for (int i = 1; i <= 4; i++)
                {
                    pages.Add(new PagerPage(i.ToString(), i.ToString(), i != currentPage));
                }
                pages.Add(new PagerPage("...", (currentPage).ToString(), false));
            }
            else if (currentPage > pageCount - 4)
            {
                pages.Add(new PagerPage("...", (currentPage).ToString(), false));
                for (int i = currentPage - 1; i <= pageCount; i++)
                {
                    pages.Add(new PagerPage(i.ToString(), i.ToString(), i != currentPage));
                }
            }
            else
            {
                pages.Add(new PagerPage("...", (currentPage).ToString(), false));
                for (int i = currentPage - 2; i <= currentPage + 2; i++)
                {
                    pages.Add(new PagerPage(i.ToString(), i.ToString(), i != currentPage));
                }
                pages.Add(new PagerPage("...", (currentPage).ToString(), false));
            }
            if (currentPage != pageCount)
            {
                pages.Add(new PagerPage("بعدی", (currentPage + 1).ToString(), currentPage != pageCount, "button"));
            }

            pages.Add(new PagerPage("آخرین", pageCount.ToString(), currentPage < pageCount, "button"));
        }

        rptPager.DataSource = pages;
        rptPager.DataBind();

    }

Screenshot

You might be having issue with your Persian characters which are not getting displayed.

Try to debugged the code