I have a Datagridview with first column as checkbox.I have created the checkboxcolumn at design itself.While updating the gridview according to the entries from database, I have to check and uncheck the checkbox programatically not all at a time but only a specific row.Please tell me how can I update check boxes programmatically.
You can bind the data from database directly to checkbox column if it is bit type in DB.
Do something like this
(row.Cells[CheckBoxColumn.Index] as DataGridViewCheckBoxCell).value = false;
During bind data you need to check it manually if flag is true then set it checked otherwise unchecked as like
set checkbox1.checked=true or false
Check datagrid prerender event, get reference to the checkbox and set value accordingly.
At the time of databinding use this code
CheckBox chkbx= e.Item.FindControl("CheckBox1") as CheckBox;
then you can manipulate chkbx.Checked to true or false based on your values
and similarly it can be used for rest of the checkboxes buttons
Related
I have winform application I want to populate a radgrid view on basis of another radgridview. I want to do this by checking a checkbox column, If the checkbox is checked I want to add an item to other radgridview and if it is unchecked I want to remove that item.
I am trying to achieve is that when the checked state of a CheckBox in one CellValueChanged event.
Use RadGridView_ValueChanged event. In this event if you have just clicked on checkbox column than if checkbox is checked its values is on otherwise off
If you are looping throgh the checkbox column then for current row checkbox value would be on or off and for other rows its value will be true / false
I have a column in my DataGridView which has the DataGridViewCheckBoxColumn as column template. When user checks the checkbox, I need to uncheck it programmatically if it fails some conditions. I have done this, but this uncheck logic only takes effect after I change the focus from the cell manually. I tried changing the focus programmatically but didn't work. Is there any solution for this?
I found the answer with little code changes. I used the cancel edit function of datagridview. For checkbox value change to be fired previously i was using this code inside
CurrentCellDirtyStateChanged event.
CommitEdit(DataGridViewDataErrorContexts.Commit)
Now i changed it to.
CommitEdit(DataGridViewDataErrorContexts.CurrentCellChange)
And called the
CancelEdit()
to roll back the changes.
Just set value of your DataGridViewCell.Value property to false (or true):
((DataGridViewCheckBoxCell)row.Cells[CheckBoxColumn.Index]).value = false;
Recently I had similar problem. Setting Cell Value on false or working with TrueValue and FalseValue (for DataGridViewCheckBoxCell) failed in my case.
Finally i manage to achieve what I wanted (unchecking if some condition fails) with simple DataGridView method:
dataGridView1.CancelEdit()
Hope it helps.
I am trying to determine if the user has selected a row to get the currently selected row. But when the form is initialized it calls the event.
Is there a way to check if the data grid view is being initialized? I thought about setting a flag and using RowPostPaint to set the flag.
Any other ways to ignore the select row event during initialization?
Maybe it helps to check if the DataGridView has the focus:
if (this.dataGridView.Focused)
{
// handle selection ...
}
On form initialization the control shouldn't have the focus but when the user manually changes the row selection it should have the focus.
And maybe you are using the wrong event to determine the row selection. Are you using "RowEnter"? I suggest you use "SelectionChanged" and then access the "SelectedRow" property.
It depends to which event you subscribe, I suppose it's SelectionChanged ?
If so - define some boolean variable (like dgvIsInitialized), set it false by default, then load data into datagridview datasource and - after loading - set it true.
And in SelectionChanged event do similar to this:
if (dgvIsInitialized)
MessageBox.Show("Selection changed");
I fill a datagridview with an data table filled by an adapter. I have some columns that are smallint. They are used as flags, like booleans.
How do I display this columns as checkboxes?
Notice, that I can't change the database column type to boolean.
You just need to create an DataGridViewCheckBoxColumn then you tell it what's falseand what's true
this.ckbCol = new System.Windows.Forms.DataGridViewCheckBoxColumn();
this.dataGridView.Columns.Add(this.active);
this.ckbCol.DataPropertyName = "ACTIVE"; //if u want to bind it to a table or something
this.ckbCol.HeaderText = "Aktiv";
this.ckbCol.Name = "Aktiv";
//Now the important stuff follows!
this.ckbCol.FalseValue = "0";
this.ckbCol.TrueValue = "1";
This works just fine for me and it's even possible to set it in the Designer!
You could use a TemplateColumn with DataBinder.Eval properly assigning the checked value to the checkbox or in the RowDataBound event handler you can check the row.DataItem and if your column is '1' you set the checkbox as checked. in the second case you get a reference to the checkbox control using (FindControl("checkboxId") as CheckBox)
You have 2 ways to do this if I remember my .Net correctly. First is the simple one don't use smallint use boolean and is will show you checkboxes by default. The second one is you have to do the gridview programatically. Use TemplateColumn and bind the data programatically in RowDataBound. her's a tutorial to help you get started http://www.asp.net/data-access/tutorials/adding-a-gridview-column-of-checkboxes-vb
I have a datagridview in which i have fourth column as checkbox.On clicking checkbox i want to get checkbox value in codebehind.Can anybody help?
You should not try to access the CheckBox.Checked value directly, rather get the value from whatever it is bound to.
If you really want to get it from the checkbox you can do something like myDataGridView.Rows[0].Cells[3].Value