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How to find all textboxes in a gridview row?

I have a GridView on a website, that have different controls in each row (eg.: textbox, label, dropdownlist). I need to find all textboxes and set the enabled property to false, so the user won't be able to edit them. I tried the code below, but it dosn't work, 'c' never recognised as a textbox, so it never changes the property.
protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (a)
{
foreach (Control c in e.Row.Controls)
{
if (c is TextBox)
{
((TextBox)(c)).Enabled = false;
}
}
}
}

I think you should try like this:
TextBox tb = e.Row.FindControl("textbox_name") as TextBox;
tb.Enabled = false;

Your textboxes must be nested within other controls, most likely cells inside the row. That is why you cannot find them just iterating through immediate children.
If you have a list of IDs of the text boxes, you should use FindControl:
((TextBox)e.Row.FindControl("TextBoxID")).Enabled = false;
Otherwise you will need to recursively find your controls of necessary type. See this thread for code sample.
One more option, if a is relatively easy to calculate, is to use in the markup directly, like so:
<asp:TextBox ... Enabled='<%# a %>' />
This depends a lot on the details of how a is derived. If it is a protected or public field of the page class, just the code above should work. If it is calculated based on row, you may need to turn it into protected method and pass params into it:
Enabled='<%# GetEnabled(Eval("Prop1"), Eval("Prop2")) %>'

And also want to put some updation.
There are different types of rows in gridview (header,footer,datarow,etc)
so for making little faster for the control find.
Try below (check the if condition)
protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//Find the TextBox control.
TextBox txtName = (e.Row.FindControl("txtName") as TextBox);
txtName.Enabled = false;
//or
TextBox txtName1 = (TextBox)e.Row.FindControl("txtName");
txtName1.Enabled = false;
}
}

You should search controls inside the cell instead of Row.
foreach (TableCell cell in e.Row.Cells)
{
foreach (Control c in cell.Controls)
{
if (c is TextBox)
{
((TextBox)(c)).Enabled = false;
}
}
}

How to obtain the value of HiddenField in a GridView when a CheckBox is checked?

I have a GridView which has multiple rows, on each row I have a CheckBox and a HiddenField. On button click I want to check if the CheckBox is checked and if it is I want to take the value of the HiddenField for that row. Each HiddenField on each row has a different value. User could check multiple CheckBoxes so I need to be able to pull the value of each HiddenField.
Any help will be really appreciate it.
Thank you

Loop through each row in the grid, check if the checkbox is checked and if it is, grab the value of the hidden field.
foreach (GridViewRow row in grdView.Rows)
{
if((row.FindControl("chkBoxId") as CheckBox).Checked)
{
string hiddenFieldValue = (row.FindControl("hiddenFieldId") as HiddenField).Value;
}
}
Where chkBoxId is the ID property of your checkbox on the page and hiddenFieldId is the ID of the hiddenfield control on your page.

Possible duplicates.
How to get values of CheckBoxes inside a gridview that are checked using asp .net
Get the id of selected checkboxes in gridview (Asp.net) c#
How to get the value in the gridview which the checkbox is checked?
One of the answer in above links :
foreach(Gridviewrow gvr in Gridview1.Rows)
{
if(((CheckBox)gvr.findcontrol("CheckBox1")).Checked == true)
{
//Get hidden field value here.
}
}

You can use a code like this:
protected void BtnMybutton_click( Object sender, EventArgs e)
{
Button Mybutton = (Button) sender;
GridViewRow row = (GridViewRow) MyButton.NamingContainer;
CheckBox ChkTest = (CheckBox) row.FindControl("ChkTest");
HidenFiekd HdfValue = (HidenField) row.FindControl("HdfValue");
if(ChkTest.Checked)
{
Console.WriteLine(HdfValues.Value);
}
}

Find Dynamically Added Controls From Gridview in SharePoint

I have a gridview in user control and added the controls dynamically using placeholder
now i find the controls from grid it give that controls are not exist in the grid
Code is as Following :
foreach (GridViewRow row in GridView1.Rows)
{
PlaceHolder plc = (PlaceHolder)row.FindControl("lblPlaceHolder");
TextBox txtTextBox1 = plc.FindControl("txtTextBox1") as TextBox; //its give Null
}
can anyone has answer plz
Added code from Comments:
foreach (GridViewRow dr in GridView1.Rows)
{ PlaceHolder placeHolder = dr.FindControl("lblPlaceHolder") as PlaceHolder;
TextBox txtTextBox1= new TextBox();
txtTextBox1.Width = 300;
placeHolder.Controls.Add(txtTextBox1);
}

Remove the placeholder, and You will be able to find your controls
and also find your controls using the onRowDatabound, or onRowCreated event from the grid.
btw: why is your placeholder called lblPlaceHolder, do You have a label in there and maybe you are asking the wrong contol to find yr textbox, thats why you are getting a null
void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
GridViewRow row = e.Row as GridViewRow;
if (row != null)
{
TableCell myCell = row.Cells[0] as TableCell
TextBox txtTextBox1= new TextBox();
txtTextBox1.Width = 300;
myCell.Controls.Add(txtTextBox1);
}
}

How to access a dynamically created control's value in a gridview in ASP.NET

I can't figure out how to access the value of a control in a dynamically-created gridview. Thhe problem is that I don't know the name of the control. If I knew the name of the control I could do just do this :
string dropDownListText =((DropDownList).row.FindControl("DropDownList1")).SelectedItem.Value;`
I know the type of control and I know the cell it is in. Is there any way using the information about the control I have to be able to access the control's value?

If you know what cell it is, then you could do something like this;
TableCell tc = GridView1.Cells[indexOfCell];
// where GridView1 is the id of your GridView and indexOfCell is your index
foreach ( Control c in tc.Controls ){
if ( c is YourControlTypeThatYouKnow ){
YourControlTypeThatYouKnow myControl = (YourControlTypeThatYouKnow)c;
}
}
If you don't know what cell it is exactly, then you can always loop through each cell. I am sure there is a better way in Linq.
With Linq (I think this should work)
var controls = GridView1.Cells[indexOfCell].Cast<Control>();
YourControlTypeThatYouKnow myControl = (YourControlTypeThatYouKnow) controls.Where( x => x is YourControlTypeThatYouKnow).FirstOrDefault();

On ItemDataBound event handler of GridView, access the table-cell as follows. Within the cell, Controls collection provides you access to ASP control embedded in the cell
TableCell cell = e.Item.Cells[0];
if (cell.Controls.Count > 0)
{
cell.Controls[0].Visible = false;
}

I have had the same problem. Add a command name to your field like CommandName="ProjectClick". Then add a rowcommand and in the row command do this:
if (e.CommandName.Equals("ProjectClick")) {
}
or you can use the text:
if (e.CommandName.Equals("")) {
if (((System.Web.UI.WebControls.LinkButton)(e.CommandSource)).Text.Equals("Projects")) {
}
}

Hiding/Unhiding Control in Gridview’s column - shifting problem

This is a follow up to my previous question:
link text
In gridview's column i have a linkbutton and a label under it.
I want to hide/unhide label when linkbutton is clicked. I use javascript because i don't want any postbacks.
The code:
protected void gvwComments_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
LinkButton lButton = ((LinkButton)e.Row.Cells[2].FindControl("lbtnExpand"));
Label label = ((Label)e.Row.Cells[2].FindControl("lblBody"));
lButton.Attributes.Add("onclick", string.Format("HideLabel('{0}'); return false;", label.ClientID));
}
}
function HideLabel(button) {
var rowObj = document.getElementById(button);
if (rowObj.style.display == "none") {
rowObj.style.display = "block";
}
else {
rowObj.style.display = "none";
}
}
The problem is that when I unhide the label by clicking on button, linkbutton is shifted a a bit upper it's original position in the cell.
Is it possible to preserve linkbutton's position in the gridviews cell?

I would suggest you change your CSS from display:none to display:hidden which will hide the control but maintain the space preventing the jumping around.

The trick is to use the keyword "this" and then get a reference to the row and change the label from there.
I have a post here, where I have a GridView with a CheckBox column and a Name column. When the CheckBox is checked the background color of the Name on that row changes. I do this starting with this attribute in the CheckBox's column:
onclick="toggleSelected(this)"
then I have a JavaScript function that finds the row and changes the next cell:
function toggleSelected(sender) {
// note that at this point the "this" is now "sender" -which is the checkbox
// get a reference to the row using the helper function - see below.
var row = GetParentElementByTagName(sender, "TR");
if (sender.checked)
row.cells[1].className = "selected";
else
row.cells[1].className = '';
}
This uses the helper function:
function GetParentElementByTagName(element, tagName) {
var element = element;
while (element.tagName != tagName)
element = element.parentNode;
return element;
}
You have a slightly different requirment so you would use something like:
var lbl = row.cells[1].childNodes[0].getElementsByTagName('label')
to get a reference to your label.