CODEWITHSUNDEEP
c#winformsdatagridviewdatagridviewrow
Haider Ali
Haider Ali

Reputation: 2795

Preventing a new row from appearing in a DataGridView before current row is filled in?

I have a DataGridView in my WinForm application in C# 3.5.

AllowUserToAddNewRow property is set true. When user types any text in DataGridView, another new row is automatically added to DataGridView. I do not want this new row added until some checks are performed on the current row and all the necessary information has been filled in there.

Example : I have a DataGridView with a blank row: DataGridView with one blank row

When I begin typing a new row is added, which is too soon:

What I want is that the new row be added only after the user enters a Quantity:

Upvotes: 9

Views: 21635

Answers (5)

Stefan Huy
Stefan Huy

Reputation: 31

Basically it's a simple play with some events and enabling/disabling the AllowUserToAddRow property:

public Form1()
        {
            InitializeComponent();
            //creating a test DataTable and adding an empty row
            DataTable dt = new DataTable();
            dt.Columns.Add("Column1");
            dt.Columns.Add("Column2");
            dt.Rows.Add(dt.NewRow());

            //binding to the gridview
            dataGridView1.DataSource = dt;

            //Set  the property AllowUserToAddRows to false will prevent a new empty row
            dataGridView1.AllowUserToAddRows = false;
        }

Now the events... When the cell recognize the editing it will fire a event called CellBeginEdit. When it's in editing mode set the AllowUserToAddRows to false

private void dataGridView1_CellBeginEdit(object sender, DataGridViewCellCancelEventArgs e)
{
    dataGridView1.AllowUserToAddRows = false;
}

When the cell recognize the end of editing it will fire a event called CellEndEdit. When it ends the editing mode check for your conditions. Based on the result set the AllowUserToAddRows to true ot keep it false.

private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
    //instead of MessageBox there could be as well your check conditions
    if (MessageBox.Show("Cell edit finished, add a new row?", "Add new row?", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
        dataGridView1.AllowUserToAddRows = true;
    else dataGridView1.AllowUserToAddRows = false;
}

Upvotes: 3

Dragon Warrior
Dragon Warrior

Reputation: 327

I know this is old. The easiest way is, uncheck "Enable Adding" from the design view

enter image description here

Upvotes: 1

arvind
arvind

Reputation: 1493

This is how it is achieved.

a) You can check contents of current row in RowLeave event using 

String.IsNullOrWhiteSpace(GridPGLog.Rows[e.RowIndex].Cells[0].value.toString())
using (or) Cells[0] || cells[1] || cell[2] || ..

if any error is found, set focus to the error cell and force user to enter data.

DataGridViewRow rowToSelect = this.dgvJobList.CurrentRow;
rowToSelect.Selected = true;
rowToSelect.Cells[0].Selected = true;
this.dgvJobList.CurrentCell = rowToSelect.Cells[0];

b) or you can place a Save button and check all newly added rows using a foreach loop

Upvotes: 0

Arif Eqbal
Arif Eqbal

Reputation: 3138

Set AllowUserToAddNewRow = false Now add a blank row initially to your datasource for eg. if you are binding the DataGridView to a DataTable called DT then just before

dataGridView1.DataSource = DT;

Do something like

 DT.Rows.Add(DT.NewRow());

This is to have one blank row initially so that the first record can be entered. Then handle the event dataGridView1.CellEndEdit, in that event write something like this:

void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
    {
        if (e.ColumnIndex == 1)//The index of your Quantity Column
        {
            int qty = (int)DT.Rows[e.RowIndex][e.ColumnIndex];
            if (qty > 0)//Your logic if required
            {
                DT.Rows.Add(DT.NewRow());                    
            }
        }
    }

Upvotes: 5

Alex
Alex

Reputation: 6149

I think on the event CellClick you can check in which column you are and then add a new row, something like : DataGridView1.Rows.Add()

Upvotes: 0

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