How to Update ONLY the Gridview in C# - c#

I have gridview in my C# ASP.net application.
When a user edits a row, all I want to do is update the gridview's datasource (Not the database yet, since I'm just taking the datagrid's datasource at the end and pushing it into my database as a dataset).
But The values I get are the old values, not the updated values im editing on the gridview.
Why is this happening? I'm following all the advice on these links.
protected void grdViewDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
GridViewRow row = (GridViewRow)grdViewDetails.Rows[e.RowIndex];
int adsf = row.Controls.Count;
foreach (Control item in row.Controls)
{
if (item.Controls[0] is TextBox)
{
TextBox textbox = (TextBox)item.Controls[0];
string x = textbox.Text;
//on the second for loop the string variable x = Employee1
}
if (item.Controls[0] is Label)
{
Label mylabel = (Label)item;
//do stuff
}
Now that textbox variable x should be xxxxxxx, but its still the old value.... why does this happen?
Cant you just update the gridview WITHOUT updating any other datasets/sources. Since I use the whole datasource of the gridview at the end.

You can access the new values with the GridViewUpdateEventArgs. Here's an example from the documentation:
void CustomersGridView_RowUpdating(Object sender, GridViewUpdateEventArgs e)
{
// Iterate through the NewValues collection and HTML encode all
// user-provided values before updating the data source.
foreach (DictionaryEntry entry in e.NewValues)
{
e.NewValues[entry.Key] = Server.HtmlEncode(entry.Value.ToString());
}
}
You can use the debugger to inspect your e variable more closely and find out which values do you need.

Related

how to get the rows property in gridview of devxpress with a button to edit?

i have a gridview with devexpress my gridview contain a id ID="GriviewLV1" and i have a button in the row of the gridview to edit the record , in the event click of the button im trying give click in the button to edit but cannot get the property rows or something like that. im trying something like this but cannot do rows property because dont exist the rows property in grid view devexpress
button_Edit_click(object sender, EventArgs e)
{
foreach (GridViewRow row in GriviewLV1.Rows)
{
}
}
And for what exactly do you need row collection?
As far as I know, you can only manipulate with records (DataSource property object). Also it is possible to get selected row. Some my code examples with explanation:
private List<ImageSetMember> imageSets;
...
//assign collection as grid's DataSource.
//From now on any actions on imageSets object will be automatically reproduced
//as grid's row changes.
imageSetGridControl.DataSource = imageSets;
...
private void replaceButtonEdit_Click(object sender, System.EventArgs e)
{
//get focused row record's index at DataSource collection
int index = imageSetGridView.GetDataSourceRowIndex(imageSetGridView.FocusedRowHandle);
var selectedImage = imageSet[index].Image; //accessing to row's record
}

ASP.NET How do I check ever row in the gridview?

I want to add value into a Grid view via dropdownlist with a button.
I want the ddTN.SelectedItem.value in the Grid view to be unique. No duplication
How do I check every row for the ddTN.SelectedItem.value before adding a new ddTN.SelectedItem.value into the Grid view?
This are the codes that I have and it keep comparing the value with the first value in the gridview. Not the others.
I don't want to use a checkbox and such. All the example I found required using checkbox.
protected void Insert(object sender, EventArgs e)
{
int i = 0;
var p = 1;
DataControlFieldCell cell = GridView1.Rows[i].Cells[p] as DataControlFieldCell;
if (cell.Text != ddTN.SelectedItem.Value)
{
dt.Rows.Add(ddTN.SelectedValue, ddDuration.SelectedValue);
ViewState["Customers"] = dt;
this.BindGrid();
label.Text = "";
p++;
}
else
{
label.Text = "Exercise already inserted";
}
}
It looks like you were intending on looping over the items in the grid but you have forgotten the looping mechanism. In your code, it always only checks the first item because i is initialized to 0 and never changes.
Try using a looping mechanism like a for loop or a while loop. Or, if you know the items in the grid from the beginning, perhaps use a hash table for quickly checking if the selected item already exists.
Keep trying, you are almost there!

Getting the value of a datagridview to a combobox. C#

The thing im trying to do is to get the value from a datagridview table already populated, to an editing phase, textbox are filling nicely but I cant find a way to assign the value of the table to a combobox item.
private void button2_Click(object sender, EventArgs e)
{
DataGridViewRow cliente = dataGridView1.CurrentRow;
textBoxDsClave.Text = cliente.Cells["dsClave"].Value.ToString();
textBoxDsRazonSocial.Text = cliente.Cells["dsRazonSocial"].Value.ToString();
comboBoxCnAceptaPromociones = cliente.Cells["cnAceptaPromociones"].Value.ToString(); //THIS ONE
}
Extra info, the data type of "cnAceptaPromociones" is bool, so it just has either "true" or "false".
I'm really new to C#, and i'm having a hard time learning.
Try setting the SelectedValue property:
comboBoxCnAceptaPromociones.SelectedValue =
Convert.ToBoolean(cliente.Cells["cnAceptaPromociones"].Value);

Updating textbox based on datagrid view

I have this datagrid view which links to the table answers in the database. The user can edit answers to questions in this form, but I'd like for the textbox to be updated as the button moves onto next answer. This is so the user can edit/delete stuff in the textbox and save it.
private void NextQuestion_Click(object sender, EventArgs e)
{
QuestionsBindingSource.MoveNext();
}
How can I get the textbox to refresh based on selected record in datagridview?
Since you are using a BindingSource, you can get the Current object, cast it to it's type, and get a value.
Let's assume you are bound to a DataTable:
private void NextQuestion_Click(object sender, EventArgs e)
{
if (QuestionsBindingSource != null)
{
QuestionsBindingSource.MoveNext();
if (QuestionsBindingSource.Current != null)
{
DataRow row = (DataRow)QuestionBindingSource.Current;
yourTextBox.Text = row["FieldYouWant"].ToString();
}
}
}
What you cast Current to and the subsequent value reference are both dependent upon what you are bound to (what QuestionsBindingSource is). Adjust this example accordingly.

Get original object from DataRow in GridView C#

I try to display a collection (IEnumerable) of objects (generated via Linq to Sql). Therefore I bind the Gridviews DataSource property to the generated output of my Linq to SQL method. In the SelectedIndexChanged event of the GridView I try to convert the selected rows DataItem back to my original object but end up with a null value instead.
Here is my code:
protected void Page_Load(object sender, EventArgs e)
{
RlDataContext dc = new RlDataContext();
this.dgvReports.DataSource = dc.GetReports(1);
this.dgvReports.DataBind();
}
protected void dgvReports_SelectedIndexChanged(object sender, EventArgs e)
{
if (this.dgvReports.SelectedIndex >= 0)
{
Report rpt = (Report)this.dgvReports.SelectedRow.DataItem;
}
}
The return type of GetReports is ISingleResult<Report>
Use a bindingsource between your datagridview and your list. When a selection is made is datagridview use the bindingsource's Current property to get you the right item from the list.
This is how I always get my information from a datagridview
string variabel = yourDataGridView["Columnname"].ToString();
You can also use this in a loop then it will be:
string variabel = yourDataGridView["RowNumber"].Cells["Columnname"].Value.ToString();
I hope this helps!

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