Show calender on image button click in gridview

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I Have a gridview, calender and image button in gridview. While clicking on image its giving error. The code is as below.

C#

protected void imgEndDate_Click1(object sender, ImageClickEventArgs e)
        {
            
            Calendar calendDate =
                             (Calendar)grvResourceDetail.SelectedRow.Cells[1].FindControl("calEndDate");
            calendDate.Visible = true;
        }

Its giving the error

Object reference not set to an instance of an object.

Both calender control and image button are in itemtemplate field of gridview. Unable to find null object.

Posted 11-Jan-16 21:05pm

Telstra

Updated 1-May-17 20:30pm

v2

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Comments

DamithSL 12-Jan-16 3:18am

debug and check which object is null

Telstra 12-Jan-16 3:24am

Both calender control and image button are in itemtemplate field of gridview. Unable to find null object.

DamithSL 12-Jan-16 3:36am

what is the full error with stack trace? we can't debug your code, you have to do that.

Richard Deeming 12-Jan-16 9:10am

Either <codde>grvResourceDetail is null;
-or- grvResourceDetail does not have a selected row;
-or- the second cell of the selected row does not contain a control with the ID calEndDate.

You need to debug your code to find out which of these is the case, and then work out why.

2 solutions

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yourfriendaks · Answer 1 · 2016-01-15T01:11:00

Exanple: try this

ASP.NET

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._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 runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnRowCommand="GridView1_RowCommand">
            <Columns>
                <asp:TemplateField HeaderText="Cal">
                    
                    <ItemTemplate>
                        <asp:Calendar runat="server" Visible="false"></asp:Calendar>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="img">
                    <ItemTemplate>
                        <asp:ImageButton ID="ImageButton1" CommandName="img" runat="server" text="show"/>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>

        </asp:GridView>
    </div>
    </form>
</body>
</html>

C#

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication1
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName=="img")
            {
                int index = Convert.ToInt32(e.CommandArgument.ToString());
                Calendar calendDate =
                             (Calendar)GridView1.Rows[index].FindControl("calEndDate");
            calendDate.Visible = true;
            }
           
        }
    }
}

Member 12978556 · Answer 2 · 2017-05-01T20:30:00

Solution 2

Instead of SelectedRow.Cells[1]
you can try this one
Calendar calendDate =
(Calendar)grvResourceDetail.Rows[0].FindControl("calEndDate");

Posted 1-May-17 20:30pm

Member 12978556

Updated 1-May-17 20:32pm

v2

Comments

CHill60 2-May-17 6:36am

Incorrect. That code will only ever look at the first row in the GridView.
And the question was answered (correctly) over a year ago.