I am new in asp.net developer.
Populated a asp.net grid view with the help of data table and my all columns are dynamic.
Now i want to add a check box in my all columns dynamically bot do not want to add in rows.
One time i can check only one check box.If i am selecting second time check box in that case first selected check box should be unchecked.
My code is below:
protected void dgvWoList_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
for (int i = 0; i < e.Row.Cells.Count; i++)
{
if (e.Row.Cells[i] != null && (!e.Row.Cells[i].IsNullOrEmpty()))
{
CheckBox chk = new CheckBox();
chk.Text = e.Row.Cells[i].Text;
e.Row.Cells[i].Controls.Add(chk);
}
}
}
}
Now i am trying to uncheck the check box but unable to do. Plz help me.
Answers:
Thanks a lot for your responses. Spl thanks AnthonyBCodes for your advise instead of check box use radio button which solved my problem. I changed my code from check box to radio button as below.
RadioButton chk = new RadioButton();
chk.GroupName = "radio";
chk.Text = e.Row.Cells[i].Text;
e.Row.Cells[i].Controls.Add(chk);
(Answered in the comments and edited into the question by the OP. Move to community wiki answer. See Question with no answers, but issue solved in the comments (or extended in chat) )
The OP wrote:
Thanks a lot for your responses. Special thanks #AnthonyBCodes for your advice instead of a check box use a radio button which solved my problem. I changed my code from a check box to a radio button as below.
RadioButton chk = new RadioButton();
chk.GroupName = "radio";
chk.Text = e.Row.Cells[i].Text;
e.Row.Cells[i].Controls.Add(chk);
I'm trying to create a Connect 4 game using textboxes and buttons.
If you click on the button, the textbox background color is filled in and the text will either be filled with x or y.
private void button2_Click(object sender, EventArgs e)
{
Output_textBox.AppendText("You have inserted in Column 2");
Output_textBox.AppendText(Environment.NewLine);
TextBox[] boxes = { textBox21, textBox22, textBox23, textBox24, textBox25, textBox26 };
for (int i = 0; i < 6; i++)
{
if (boxes[i].BackColor != SystemColors.HotTrack)
{
boxes[i].BackColor = SystemColors.HotTrack;
boxes[i].Text = "Y";
}
}
}
(edited on 11/6/2013 2:25pm)
The Code above doesn't seem to work even though it seems to make perfect sense to me that it should.
What i want is for the textbox to turn one by one. So if i click on the button once. textbox11 changes first. Then if textbox11 is filled, textbox12 is filled next when i click on the button again etc.
The coloring needs to be from bottom to top in a column
About me: I'm new to coding. Sorry for the trouble
Thank you in advanced
Here is a short program that reproduces the problem I just encountered. This was compiled under MS Windows 7 with .NET 4.0, just in case that makes a difference.
using System;
using System.Drawing;
using System.Windows.Forms;
// Compile with "csc /target:exe /out:comboboxbug.exe /r:System.dll /r:System.Drawing.dll /r:System.Windows.Forms.dll comboboxbug.cs"
// in a Visual Studio command prompt.
static class Program
{
[STAThread]
static void Main()
{
//Create a label.
Label oLabel = new Label();
oLabel.Location = new Point (10, 10);
oLabel.Size = new Size (100, 15);
oLabel.Text = "Combo box bug:";
// Create a combo-box.
ComboBox oComboBox = new ComboBox();
oComboBox.Location = new Point (10, 50);
oComboBox.Size = new Size (150, 21);
oComboBox.Items.AddRange (new object[]
{ "A", "A B", "A C", "A B C", "A C B", "A B C D", "A C B D" });
oComboBox.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
oComboBox.AutoCompleteSource = AutoCompleteSource.ListItems;
oComboBox.SelectionChangeCommitted
+= new EventHandler (comboBox_SelectionChangeCommitted);
// Create a form.
Form oForm = new Form();
oForm.Size = new Size (200, 150);
oForm.Controls.Add (oLabel);
oForm.Controls.Add (oComboBox);
// Run this form.
Application.Run (oForm);
}
static void comboBox_SelectionChangeCommitted (object sender,
EventArgs e)
{
MessageBox.Show ("SelectionChangeCommitted");
}
}
Click in the text portion of the combo-box and type "A". You will get a list of autocomplete suggestions. Click one of the selections with your mouse. The SelectionChangeCommitted event doesn't happen!
Select a menu-item without using autocomplete. You'll get a message-box showing that the SelectionChangeCommitted event happened!
Given that the selection was changed by the user in both cases, shouldn't SelectionChangeCommitted be called in both cases?
Using the SelectedIndexChanged event is not an option, because for the application behind this canned example, I only want it to happen when the user makes a selection, not when it's set programmatically.
EDIT 2020-Oct-28: I found another case where SelectionChangeCommitted doesn't get called! Auto-complete doesn't even need to be set for the problem to happen! Click to open the combo-box, press a key that matches the beginning of one of the combo-box items, and then press Tab to leave. The combo-box item gets selected, but SelectionChangeCommitted is not called! My revised answer is below.
Using the SelectedIndexChanged event is not an option, because for the application behind this canned example, I only want it to happen when the user makes a selection, not when it's set programmatically.
You could also accomplish this by writing a wrapper method for changing the selection that temporarily disables your event.
Unfortunately I do not know off hand a solution to the issue that SelectionChangeCommitted not being started for the more general case (such as where you don't control the ComboBox or how it is accessed).
EDIT:
I made a streamer of all the events that ComboBox calls, and it doesn't appear that any other event will do what you are looking for. The only solution I can think of would involve hooking into the events that the AutoComplete triggers. The difficulty is knowing what those events are, since they don't appear to trigger off the ComboBox from what my minor testing shows.
FYI, here was the best solution I ever came up with. Obviously, this is a Leave event-handler on a ComboBox subclass. The SelectionChangeCommitted event doesn't happen on the mouse-click, but at least it happens during the normal flow of GUI interaction.
private void this_Leave (object sender, EventArgs e)
{
// If this is an autocomplete combo-box, select the
// item that was found by autocomplete.
// This seems like something that ComboBox should be
// doing automatically...I wonder why it doesn't?
if (this.AutoCompleteMode != AutoCompleteMode.None)
{
// Determine which combo-box item matches the text.
// Since IndexOf() is case-sensitive, do our own
// search.
int iIndex = -1;
string strText = this.Text;
ComboBox.ObjectCollection lstItems = this.Items;
int iCount = lstItems.Count;
for (int i = 0; i < iCount; ++i)
{
string strItem = lstItems[i].ToString();
if (string.Compare (strText, strItem, true) == 0)
{
iIndex = i;
break;
}
}
// If there's a match, and this isn't already the
// selected item, make it the selected item.
//
// Force a selection-change-committed event, since
// the autocomplete was driven by the user.
if (iIndex >= 0
&& this.SelectedIndex != iIndex)
{
this.SelectedIndex = iIndex;
OnSelectionChangeCommitted (EventArgs.Empty);
}
}
}
If someone got this problem, I suggest a solution that works fine to me...
Think with me, to accept the suggest of Combo-box, generally the user needs to key down with an Enter key.
You can write into KeyDown event of Combo-box property, something like this:
private void cboProperty_SelectionChangeCommitted(object sender, EventArgs e)
{
//Call here the event of SelectionChangeCommitted
cboProperty_SelectionChangeCommitted(sender,null);
}
It will raise the SelectionChangeCommitted on the right time.
This workaround worked fine for me and hope for you too. When use Autocomplete by typing data in your combo box to get an item through keyboard or mouse selection you need _KeyDown event. From inside invoke _SelectionChangeCommitted method which contains code for other operations. See code below:
private void YourComboBox_KeyDown(object sender, KeyEventArgs e)
{
//Works also when user select and click on autocomplete list.
if (e.KeyCode == Keys.Enter && YourComboBox.SelectedItem != null)
YourComboBox_SelectionChangeCommitted(sender, e);
}
For the non-auto-complete case mentioned above (i.e. my 2020-Oct-28 edit), this Leave event-handler on a ComboBox subclass incorporates the new case as well as the old one, as long as your SelectionChangeCommitted event-handler is idempotent. Compared to my previous answer, it removes the test for auto-complete, and always calls OnSelectionChangeCommitted().
private void this_Leave (object sender, EventArgs e)
{
// Determine which combo-box item matches the text.
// Since IndexOf() is case-sensitive, do our own
// search.
int iIndex = -1;
string strText = this.Text;
ComboBox.ObjectCollection lstItems = this.Items;
int iCount = lstItems.Count;
for (int i = 0; i < iCount; ++i)
{
string strItem = lstItems[i].ToString();
if (string.Compare (strText, strItem, true) == 0)
{
iIndex = i;
break;
}
}
// If there's a match, and this isn't already the
// selected item, make it the selected item.
if (iIndex >= 0
&& this.SelectedIndex != iIndex)
this.SelectedIndex = iIndex;
// Force a selection-change-committed event, since
// the autocomplete was driven by the user.
OnSelectionChangeCommitted (EventArgs.Empty);
}
I'm new to C# and I have a question which I couldn't find somehwere else.
I created a ComboBox like this:
ComboBox lijst = new ComboBox();
Also I added some items and a location:
lijst.Location = new Point(400, 25);
lijst.Text = "Basis";
lijst.Items.Add("Basis");
lijst.Items.Add("Zuilen");
lijst.Items.Add("Vuur");
lijst.Items.Add("Zigzag");
The thing is you can select a item now and press a button which triggers the next method.
private void bereken(object sender, System.EventArgs e)
{
string nr = Convert.ToString(lijst.SelectedIndex);
Label tekstuitvoer = new Label();
tekstuitvoer.Location = new Point(100, 100);
tekstuitvoer.Size = new Size(70, 20);
tekstuitvoer.Text = nr;
this.Controls.Add(tekstuitvoer);
}
But here is my problem. Once you press the button, the outcome of tekstuitover.Text will always be the same. So if you press the button while "Vuur" is selected then the outcome will always be 2. It doesnt matter if you change the combobox item afterwards. The output will always be 2. But when I restart the program and select the fourth option instead of the third, now the outcome always will be 3.
Can you help me with this problem? Is there a way to reset string nr?
Thanks in advance. I hope you guys can help me!
Took me a while to figure out what you were saying there.
Add a SelectedIndexChanged event handler to your combobox, and trigger your label code from there, you can get rid of the button.
However as things stand you are going to create a new label component every time it changes.
Simpler to just add one at design time and set the text property in the event.
i have 10 textboxes and i need to select text from each one of them.
The problem is that i cant select text from multiple textboxes.
Is there any solution for this problem my code is.
private void Form1_Load(object sender, EventArgs e)
{
createTextBoxes(10);
((TextBox)textBoxes[0]).Select(1, 4);
((TextBox)textBoxes[1]).Select(1, 4); // <- it will not select text
((TextBox)textBoxes[2]).Select(1, 4); // same here
}
Control[] textBoxes;
private void createTextBoxes(int cnt)
{
textBoxes = new Control[cnt];
for (int i = 0; i < cnt; i++)
{
TextBox tb = new TextBox();
tb.Name = i.ToString();
tb.Location = new Point(5, 5 + 14 * i);
tb.Size = new Size(600, 20);
tb.BorderStyle = BorderStyle.None;
tb.Text = "sample text" + i.ToString();
textBoxes[i] = tb;
this.Controls.Add(tb);
}
}
Set the HideSelection property of the texboxes to false. They will maintain selection after losing focus.
Only one control can have a "Focus" at a time... you can't select (ie:highlight) text of multiple controls.
I also just tested by adding a button to the form and posted your 3 "select" snippets there too... nothing showed highlighted. However, when I did a TAB through each control, the first 3 respectfully showed the highlighted section. When I tabbed through the rest, the entire field of the rest of the textboxes were fully selected.
Or are you really trying to accomplish something else...
The text is selected you just can't see it cause of focus.
I ran your code and after doing so tabbed through the controls. The first 3 are selected as specified.
This is possibly not working because even though you've added the TextBox instances to the Form, they have not yet been displayed. Until they are displayed and initially rendered it's likely not possible to initiate a selection on them.
Actually it does, the problem is that the other 2 of your textboxes ([1] and [2]) don't have focus. Only one control can have focus at a time. If you hit tab to give focus to the next TextBox, you'll see the text selected.