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I have a GridView displaying person records. I want to conditionally show a CommandField or ButtonField based on some property of the underlying record. The idea is to only allow a command to be performed on specific people.
What is the best way to do this? I'd prefer a declarative solution to a procedural one.
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If you want to hide the entire column with that field, you can just do a GridView1. Columns[0]. Visible = false; Change the index to whatever column your edit one is.
Using Inline Expression, the value of the EVAL function is compared and if the Status value is A then the Delete Button is displayed else the Button is hidden. Note: The syntax of using EVAL function within Inline Expression is different for C# and VB.Net.
First, convert your ButtonField or CommandField to a TemplateField, then bind the Visible property of the button to a method that implements the business logic:
<asp:GridView runat="server" ID="GV1" AutoGenerateColumns="false"> <Columns> <asp:BoundField DataField="Name" HeaderText="Name" /> <asp:BoundField DataField="Age" HeaderText="Age" /> <asp:TemplateField> <ItemTemplate> <asp:Button runat="server" Text="Reject" Visible='<%# IsOverAgeLimit((Decimal)Eval("Age")) %>' CommandName="Select"/> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> Then, in the code behind, add in the method:
protected Boolean IsOverAgeLimit(Decimal Age) { return Age > 35M; } The advantage here is you can test the IsOverAgeLimit method fairly easily.
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it could be done when the RowDataBound event fires
protected void GridView_RowDataBound(Object sender, GridViewRowEventArgs e) { if(e.Row.RowType == DataControlRowType.DataRow) { // Hide the edit button when some condition is true // for example, the row contains a certain property if (someCondition) { Button btnEdit = (Button)e.Row.FindControl("btnEdit"); btnEdit.Visible = false; } } } Here's a demo page
markup
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="DropDownDemo._Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> <title>GridView OnRowDataBound Example</title> </head> <body> <form id="form1" runat="server"> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"> <Columns> <asp:BoundField HeaderText="Name" DataField="name" /> <asp:BoundField HeaderText="Age" DataField="age" /> <asp:TemplateField> <ItemTemplate> <asp:Button ID="BtnEdit" runat="server" Text="Edit" /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> </form> </body> </html> Code Behind
using System; using System.Collections.Generic; using System.Web.UI.WebControls; namespace GridViewDemo { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { GridView1.DataSource = GetCustomers(); GridView1.DataBind(); } protected override void OnInit(EventArgs e) { GridView1.RowDataBound += new GridViewRowEventHandler(GridView1_RowDataBound); base.OnInit(e); } void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType != DataControlRowType.DataRow) return; int age; if (int.TryParse(e.Row.Cells[1].Text, out age)) if (age == 30) { Button btnEdit = (Button) e.Row.FindControl("btnEdit"); btnEdit.Visible = false; } } private static List<Customer> GetCustomers() { List<Customer> results = new List<Customer>(); results.Add(new Customer("Steve", 30)); results.Add(new Customer("Brian", 40)); results.Add(new Customer("Dave", 50)); results.Add(new Customer("Bill", 25)); results.Add(new Customer("Rich", 22)); results.Add(new Customer("Bert", 30)); return results; } } public class Customer { public string Name {get;set;} public int Age { get; set; } public Customer(string name, int age) { Name = name; Age = age; } } } In the demo, the Edit Button is not Visible (the HTML markup is not sent to the client) in those rows where the Customer's age is 30.
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