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Now you have to implement the GetEmployees() method and decide how you want to perform the sorting. The easiest approach is to fill a disconnected DataSet so you can rely on the sorting functionality of the DataView. Here s an example of a GetEmployess() method in a database component that performs the sorting in this way: public EmployeeDetails[] GetEmployees(string sortExpression) { SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand("GetAllEmployees", con); cmd.CommandType = CommandType.StoredProcedure; SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); try { con.Open(); adapter.Fill(ds, "Employees"); } catch (SqlException err) { // Replace the error with something less specific. // You could also log the error now. throw new ApplicationException("Data error."); } finally { con.Close(); } // Apply sort. DataView view = ds.Tables[0].DefaultView; view.Sort = sortExpression; // Create a collection for all the employee records. ArrayList employees = new ArrayList(); foreach (DataRowView row in view) { EmployeeDetails emp = new EmployeeDetails( (int)row["EmployeeID"], (string)row["FirstName"], (string)row["LastName"], (string)row["TitleOfCourtesy"]); employees.Add(emp); } return (EmployeeDetails[])employees.ToArray(typeof(EmployeeDetails)); } Another approach is to change the actual query you re executing in response to the sort expression. This way, your database can perform the sorting. This approach is a little more complicated, and no perfect option exists. Here are the two most common possibilities: You could dynamically construct a SQL statement with an ORDER BY clause. However, this risks SQL injection attacks, unless you validate your input carefully. You could write conditional logic to examine the sort expression and execute different queries accordingly (either in your select method or in the stored procedure). This code is likely to be fragile and involves a fair bit of string parsing.

If you use sorting and selection at the same time, you ll discover another issue To see this problem in action, select a row, and then sort the data by any column You ll see that the selection will remain, but it will shift to a new item that has the same index as the previous item In other words, if you select the second row and perform a sort, the second row will still be selected in the new page, even though this isn t the record you selected The only way to solve this problem is to programmatically change the selection every time a header link is clicked The simplest option is to react to the GridViewSorted event to clear the selection, as shown here: protected void GridView1_Sorted(object sender, GridViewSortEventArgs e) { // Clear selected index GridView1.

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SelectedIndex = -1; } In some cases you ll want to go even further and make sure a selected row remains selected when sorting changes The trick here is to store the selected value of the key field in view state each time the selected index changes: protected void GridView1_SelectedIndexChanged(object sender, EventArgs e) { // Save the selected value if (GridView1SelectedIndex != -1) { ViewState["SelectedValue"] = GridView1SelectedValueToString(); } } Now, when the grid is bound to the data source (for example after a sort operation), you can reapply to the last selected index: protected void GridView1_DataBound(object sender, EventArgs e) { if (ViewState["SelectedValue"] != null) { string selectedValue = (string)ViewState["SelectedValue"]; // Reselect the last selected row foreach (GridViewRow row in GridView1Rows) { string keyValue = GridView1DataKeys[rowRowIndex]ValueToString(); if (keyValue == selectedValue) { GridView1SelectedIndex = row.

RowIndex; return; } } } } Keep in mind that this approach can be confusing if you also have enabled paging (which is described later in the section Paging the GridView ) That s because a sorting operation might move the current row to another page, rendering it not visible but keeping it selected This is a perfectly valid situation from a code standpoint but confusing in practice..

as HTTP, HTTPS and FTP essentially the common protocols found on the Web today. The path format shared by these protocols is as follows: used to access the resource, such as for standard HTTP. This is a slight extension to the scheme portion of the URI because it is assumed that all URL protocols will include two forward slashes following the colon. the resource can be found, such as .

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