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POHow do I keep sorting order while paging in gridView?
 

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  1. POHow do I keep sorting order while paging in gridView?
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    <p>I am displaying information using gridView. It works absolutely perfect for me except for one detail. If the user sorts a column and then clicks to go to another page then the sorting is lost. Basically I need the sorting to persist while paging occurs, any help would be most appreciated. Here is the code I have:</p> <pre><code>public partial class DynamicGridView : System.Web.UI.UserControl { protected void Page_Load(object sender, EventArgs e) { if (_selectCmd != string.Empty) BindData(); } private void BindData() { DataTable dt; if (ViewState[gridView.ClientID + "datatable"] == null || (string)ViewState[gridView.ClientID + "selectCommand"] != _selectCmd) { ViewState[gridView.ClientID + "selectCommand"] = _selectCmd; dt = Classes.SQL.GetDataTable(_selectCmd); if (dt != null) { ViewState[gridView.ClientID + "datatable"] = dt; if (dt.Columns.Count != gridView.Columns.Count) { gridView.Columns.Clear(); foreach (DataColumn column in dt.Columns) AddBoundField(column); } } } else dt = (DataTable)ViewState[gridView.ClientID + "datatable"]; gridView.DataSource = dt; gridView.DataBind(); } private void AddBoundField(DataColumn column) { BoundField field = new BoundField(); HandleCustomDataFormatting(ref field, column); field.DataField = column.ColumnName; field.HeaderText = column.ColumnName; field.ReadOnly = true; field.SortExpression = column.ColumnName; field.ControlStyle.ForeColor = System.Drawing.ColorTranslator.FromHtml("#333333"); field.ItemStyle.Width = System.Web.UI.WebControls.Unit.Pixel(70); gridView.Columns.Add(field); } private void HandleCustomDataFormatting(ref BoundField field, DataColumn column) { if (column.DataType == typeof(System.DateTime)) switch (column.ColumnName) { case "InvalidDate": case "NewCustomerValidated": case "ValidatedDate": field.DataFormatString = "{0:d}";//exclude time info break; default: field.DataFormatString = "{0:g}"; break; } } private string GetSortDirection(string sortColumn) { string sortDirection = "ASC"; string lastSortColumn = (string)ViewState[gridView.ClientID + "SortExpression"]; if (lastSortColumn != null &amp;&amp; lastSortColumn == sortColumn) { string lastDirection = (string)ViewState[gridView.ClientID + "SortDirection"]; if (lastDirection != null &amp;&amp; lastDirection == "ASC") sortDirection = "DESC"; } ViewState[gridView.ClientID + "SortExpression"] = sortColumn; ViewState[gridView.ClientID + "SortDirection"] = sortDirection; return sortDirection; } private string _selectCmd = string.Empty; public string SelectCommand { set { _selectCmd = value; } } protected void GridView_Sorting(object sender, GridViewSortEventArgs e) { DataTable dt = (DataTable)ViewState[gridView.ClientID + "datatable"]; dt.DefaultView.Sort = e.SortExpression + " " + GetSortDirection(e.SortExpression); BindData(); } protected void GridView_PageChange(object sender, GridViewPageEventArgs e) { gridView.PageIndex = e.NewPageIndex; BindData(); } } </code></pre>
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    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USChris
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. PO
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    2. PO
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    1. This table or related slice is empty.
    1. COAre you storing the `DataTable` and the sql-command in `ViewState`? Don't do that. The former blows up the ViewState which slows down your application because it sends this viewstate back and forth between your client and your server. The latter is not safe, do you want that every user is able to see your sql-queries by decoding ViewState? Use `Session` if you need to persist it or reload it from database.
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      1. POHow do I keep sorting order while paging in gridView?
      1. USTim Schmelter
    2. COAlso note for queries that would generate large amounts of data you may need to just fetch one page of data from the DB and then go and fetch a brand new page each time the page changes, if it's not practical to store the entire result set in `Session`.
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      1. POHow do I keep sorting order while paging in gridView?
      1. USServy
    3. COTim, This application is for "in-house" use only on a local intranet. Furthermore it will be used by a handful of people so I am not too worried about them seeing the SQL queries. I do agree with you however on all points you made. Thank you.
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      1. POHow do I keep sorting order while paging in gridView?
      1. USChris
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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