How to Programmatically Set Cell Value in Datagridview

How to programmatically set cell value in DataGridView?

If the DataGridView is databound, you shouldn't directly modify the content of the cell. Instead, you should modify the databound object. You can access that object through the DataBoundItem of the DataGridViewRow :

MyObject obj = (MyObject)dataGridView.CurrentRow.DataBoundItem;
obj.MyProperty = newValue;

Note that the bound object should implement INotifyPropertyChanged so that the change is reflected in the DataGridView

Change DataGridView Cell Value Programmatically

The changing of the cell needs to happen after the validating event, so try the CellValidated event instead:

void dgv_CellValidated(object sender, DataGridViewCellEventArgs e) {
  string cellValue = dgv.Rows[e.RowIndex].Cells[e.ColumnIndex].FormattedValue.ToString();
  if (cellValue.Contains('G') || cellValue.Contains('g')) {
    dgv.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = "abc";
  }
}

Add cell value after set datasource of datagridview

Try this..

if (row.Index != 0)
{
    //replace RowObject with the name of your underlying class that constitutes each 
    //row
    RowObject obj = (RowObject)row.DataBoundItem;

    //replace DiscountProperty and TaxProperty with the names of the properties on 
    //your RowObject that correspond to these values
    obj.DiscountProperty = "10";
    obj.TaxProperty = "10";
}    

Hopefully this will work for you. Here is a link to a similar question that elaborates more on why you should update the data this way when modifying a DataGridView with an underlying DataSource. Programmatically set cell value in data grid view

Change datagridview cell value in edit mode

When the cell is in edit mode you need to change the text in the edit control, usually a Textbox. You can get (and hold) a handle to it in the EditingControlShowing event:

TextBox editBox = null;

private void dataGridView1_EditingControlShowing(object sender,
                           DataGridViewEditingControlShowingEventArgs e)
{
    if (e.Control is TextBox) editBox = e.Control as TextBox;
}

But using the CellEnter event is not a good idea as it will be called when scrolling or clicking around as well..

To catch the beginning of editing you use the BeginEdit event:

int yourEditColumn = 5;

private void dataGridView1_CellBeginEdit(object sender, DataGridViewCellCancelEventArgs e)
{
    if (e.ColumnIndex == yourEditColumn )
    {
        string yourValue = "12345";
        dataGridView1.Rows[e.RowIndex].Cells[yourEditColumn ].Value = yourValue;
        if (editBox != null)   editBox.Text = yourValue;
    }
}

Change value in DataGridView directly

You can simply do this (assuming that you want to change one value programmatically):

dataGridView1.Rows[RowNumber].Cells[CC.Index].Value = newValue;

And how to enable editing of certain cell was already explained here.

How to dynamically assign Datagridview cell values based on data from my database?

I would do this on the DataBindingComplete event:

private void dataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
        foreach (DataGridViewRow r in dataGridView1.Rows)
        {
            if (r.Cells["status"].Value.ToString() == "Online")
            {
               //add image here
            }
        }
}

Your datagrid would need to attach to the DataBindingComplete as well

This answer might also be useful:

https://stackoverflow.com/a/8182203/2589202

How to set Cell value of DataGridViewRow by column name?

So in order to accomplish the approach you desire it would need to be done this way:

//Create the new row first and get the index of the new row
int rowIndex = this.dataGridView1.Rows.Add();

//Obtain a reference to the newly created DataGridViewRow 
var row = this.dataGridView1.Rows[rowIndex];

//Now this won't fail since the row and columns exist 
row.Cells["code"].Value = product.Id;
row.Cells["description"].Value = product.Description;

How to add a Cell programmatically to a DataGridView?

Two ways:

• You need to have a Column first, then you can replace any Cell in the Column by whatever type of Cell you want to create:

---

DataGridViewTextBoxColumn normalColumn = new DataGridViewTextBoxColumn();
DGV_Points.Columns.Insert(yourColumnIndex, normalColumn);
DGV_Points.Rows.Add(11);  // we need at least one row where we can insert a cell
DataGridViewComboBoxCell aCell = new DataGridViewComboBoxCell();
DGV_Points.Rows[someRowIndex].Cells[yourColumnIndex] = aCell;

• Or you create that Column to have the ColumnType you want and all Cells in the Column will have the right Type from the beginning:

---

DataGridViewComboBoxColumn comboCol = new DataGridViewComboBoxColumn();
comboCol.HeaderText = "yourHeaderText";
DGV_Points.Columns.Insert(yourColumnIndex, comboCol);

Note that the first method creates only as many DataGridViewComboBoxCells as you make it to whereas the second way immediatly create a DataGridViewComboBoxCell in each Row. It is up to you to decide what you want..

Instead or Inserting at a given position you may want to simply Add the Column. The Add method returns the Index of the new Column.

Since we are adding a DataGridViewComboBoxCells here is an example how you can fill the Items of the new dropdown cell:

List<string> items1 = new List<string> (){ "111", "222", "333", "444", "555" };
((DataGridViewComboBoxCell)DGV_Points.Rows[2].Cells[0] ).Items
                                     .AddRange(items1.ToArray());
DGV_Points.Rows[2].Cells[0].Value = "222";

This fills the dropdownlist of the cell in row 2, column 0 with five string values and select the value to be "222". Note that this way you must fill the Items of each Cell and you can fill each one with a different list of values to choose from.

You can also set an individual Cell's DataSource: aCell.DataSource = items1; or you can set it for the Column: comboCol.DataSource = items1;

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