Hide gridview column

Question

0.00/5 (No votes)

See more:

XML

Can some one tell me why this code is giving me these error:

<pre lang="msil">Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 34:         else
Line 35:         {
Line 36:             grdAvailableStuff.HeaderRow.Cells[2].Visible = false;
Line 37:
Line 38:</pre>


Code below

<pre lang="cs">protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {
            radDoctors.Checked = false;
            radNurses.Checked = false;
        }
        if (grdAvailableStuff.Columns.Count == 0)
        {
            grdAvailableStuff.Columns[2].Visible = false;


        }
        else
        {
            grdAvailableStuff.HeaderRow.Cells[2].Visible = false;


            foreach (GridViewRow grd in grdAvailableStuff.Rows)
            {
                grd.Cells[2].Visible = false;


            }
        }

    }</pre>

Posted 16-Jun-11 3:29am

Anele Ngqandu

Add a Solution

4 solutions

Solution 2

you can also do this in .aspx page using

if condition
set the global variable to the .cs file

check the value of that global variable using if condition
and you can visible or invisible that column accordingly.

Posted 16-Jun-11 3:56am

suniltikli

Solution 3

I suggest that go via ColumnName not via Index

if (GridView1.Columns["FieldID"] != null) GridView1.Columns["FieldID"].Visible = false;

And for setting visibility property for the columns, no need to use RowDataBound event. Directly after binding the grid call the above line

Posted 16-Jun-11 4:05am

nit_singh

Comments

Anele Ngqandu 16-Jun-11 10:13am

it doesnt allow me to put strings inside square bruckets

Solution 4

set 'Visible=False' property as like this

u can hide any control on the page

Posted 16-Jun-11 5:00am

Srinivas Kumar Pasumarthi

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

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

**R. Giskard Reventlov** · Accepted Answer · 2011-06-16T03:43:00

Solution 1

Do this in the RowCreated method. You can use code similar to the following:

C#

protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.Header)
    {
        e.Row.Cells[0].Visible =
            e.Row.Cells[1].Visible =
            e.Row.Cells[3].Visible = false;

        // and so on and so forth...
    }
}

You can manipulate data and cells in the RowDataBound event.

Posted 16-Jun-11 3:43am

R. Giskard Reventlov

Comments

Anele Ngqandu 16-Jun-11 9:51am

But intelisense cant event find RowDataBound

R. Giskard Reventlov 16-Jun-11 9:55am

In the properties grid for the GridView it is marked as an event (in the event tab of the control - the little button with the lightning in it). Double-Click on RowDataBound and it the method will be created for you.

Anele Ngqandu 16-Jun-11 10:08am

yes sir but its only hiding the header not the whole column

Anele Ngqandu 16-Jun-11 10:17am

ok this is what i tried see below:

if (e.Row.RowType == DataControlRowType.DataRow)
{

e.Row.Cells[3].Visible = false;

}
if (e.Row.RowType == DataControlRowType.Header)
{

e.Row.Cells[3].Visible = false;

}

R. Giskard Reventlov 16-Jun-11 10:33am

That is correct though you can combine with:
if (e.Row.RowType == DataControlRowType.DataRow || e.Row.RowType == DataControlRowType.Header)