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A Simple Way for Paging in DataGridView in WinForm Applications

, 15 Jun 2011 CPOL
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An easy way for paging DataGridView

Introduction

I have recently worked on paging in DataGridView for a WinForm application. I Googled it, but generally found very complicated codes. So I wanted to write my code to be easily understood by everyone. After some modifications, I tried to make my code really simple and want to share it with others.

image001.jpg

I have used button controls for the purpose of navigating switches.

I added required variables such as PgSize for number of rows per page, CurrentPageIndex for current page index and Totalpage for calculating maximum number of pages DataGridView is able to display.

private int PgSize = 20; 
private int CurrentPageIndex = 1;
private int TotalPage=0; 

As the name suggests, the following method is used to calculate the total number of pages for gridview:

private void CalculateTotalPages()
{
    int rowCount = ds.Tables["Customers"].Rows.Count;
    TotalPage = rowCount / PgSize;
    // if any row left after calculated pages, add one more page 
    if (rowCount % PgSize > 0)
        TotalPage += 1;
}

In order to retrieve records to display for the navigated page, I used a DataTable returned from GetCurrentRecord() method as datasource for gridview. This method returns the top 20 rows, (Size of PgSize variable) if navigated page is one. If navigated page is greater than one, then it calculates the previous pageOffset through the following line of code:

int PreviousPageOffSet= (page - 1) * PgSize; 

Now the query work starts, to select only pages from the current page and leaving earlier records apply query available in the following code:

private DataTable GetCurrentRecords(int page, SqlConnection con)
{
    DataTable dt = new DataTable();

    if (page == 1)
    {
        cmd2 = new SqlCommand("Select TOP " + PgSize + 
		" * from Customers ORDER BY CustomerID", con);
    }
    else
    {
        int PreviousPageOffSet= (page - 1) * PgSize;

        cmd2 = new SqlCommand("Select TOP " + PgSize +
        	" * from Customers WHERE CustomerID NOT IN " +
        	"(Select TOP " + PreviousPageOffSet+ 
	" CustomerID from customers ORDER BY CustomerID) ", con);
    }
    try
    {
        // con.Open();
        this.adp1.SelectCommand = cmd2;
        this.adp1.Fill(dt);
    }
    finally
    {
        con.Close();
    }
    return dt;
}

Navigating buttons are as usual. Here we only calculate the navigating pageIndex and pass it to GetCurrentRecords() method as argument to retrieve dataSource for our datagridview.

    private void btnFirstPage_Click(object sender, EventArgs e)
    {
        this.CurrentPageIndex = 1;
        this.dataGridView1.DataSource = GetCurrentRecords(this.CurrentPageIndex, con);
    }

    private void btnNxtPage_Click(object sender, EventArgs e)
    {
        if (this.CurrentPageIndex < this.TotalPage)
        {
            this.CurrentPageIndex++;
            this.dataGridView1.DataSource = 
		GetCurrentRecords(this.CurrentPageIndex, con);
        }
    }

    private void btnPrevPage_Click(object sender, EventArgs e)
    {
        if (this.CurrentPageIndex > 1)
        {
            this.CurrentPageIndex--;
            this.dataGridView1.DataSource = 
		GetCurrentRecords(this.CurrentPageIndex, con);
        } 
    }

    private void btnLastPage_Click(object sender, EventArgs e)
    {
        this.CurrentPageIndex = TotalPage;
        this.dataGridView1.DataSource = GetCurrentRecords(this.CurrentPageIndex, con); 
    }

    private void button1_Click(object sender, EventArgs e)
    {
        this.Close(); 
    }
  }
}

I hope this is the easiest way for paging a DataGridView.

This is my first article I have ever posted and I have tried my best to explain my code. So I welcome any type of suggestions.

History

  • 15th June, 2011: Initial version

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

sk saini
Software Developer (Senior) Embossoft Solutions
India India
Software developer with 3+ years of experience in c# Winform applications development on ASP.NET platform.

Comments and Discussions

 
SuggestionThank you PinprofessionalAn@nd Rajan19-Jan-14 22:54 
Questionsearch datagridview with paging c# PinmemberMember 104267332-Dec-13 21:41 
QuestionPaging bottom PinmemberMember 1041171221-Nov-13 4:14 
SuggestionPaging code on DatagridView PinmemberMember 1028363216-Oct-13 21:51 
QuestionGetting Exception PinmemberMember 101748035-Aug-13 20:54 
Questionhi everybody if any of you are still interested in datagridview paging, would you please try this one? thanks! PinmemberAlejandro Miralles28-Dec-12 9:35 
I'll be posting an article here on codeproject on this subject in the near future, but in the meantime I'll be posting updates on my blog on how to do paging, conditional formatting, searching, sorting, and so on.... using a lot of LINQ goodnesses. When the whole thing is complete I'll post the complete article, if you are interested in something related to the WinForms DataGridView in particular, ping me, I'll try to include it. Thanks.
 
http://www.alemiralles.blogspot.com.ar/2012/12/winforms-datagridview-paging-right-way.html[^]
QuestionThank's Buddy Pinmemberdeid4r419-Dec-12 17:16 
GeneralVirtual Mode is better Pinmembernamdia16-Jun-11 9:32 
GeneralMy vote of 2 PinmemberSelvin16-Jun-11 0:43 
GeneralMy vote of 5 PinmemberMonjurul Habib15-Jun-11 9:21 
GeneralMy vote of 4 Pinmemberrajeshrisharma15-Jun-11 5:31 
GeneralRe: My vote of 4 Pinmembermadanbhanu9-Aug-12 20:26 
GeneralRe: My vote of 4 PinmemberDirk_Strauss12-Feb-14 13:46 

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