how to prevent datagridview to allow null in cells

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when i enter data from datagridview to database it also allow null..but i wanted to prevent null value to enter in the database from gridview.in gridview i take textboxes that have 3 columns:id,name and city.if i enter id and city,datagridview allow that and does not give any error.so my question is if user put the cells blank datagridview does not allow user to move next cell untill user input in that cells
I tried some code but not work like:

C#

private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
        {
            int i = dataGridView1.Rows.Count;
            for (int j = 0; j < i; j++)
            {


                if (dataGridView1.Rows[j].Cells[0].Value == null)
                {
                    MessageBox.Show("Field 1 is empty");
                }
                else if(dataGridView1.Rows[j].Cells[2].Value == null)
                {
                    MessageBox.Show("Field 2 is empty");

                }
                else if (dataGridView1.Rows[j].Cells[2].Value == null)
                {
                    MessageBox.Show("Field 3 is empty");

                }

            }

        }

Posted 20-Dec-14 21:55pm

rajesh mahesh bhai

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Comments

Tushar sangani 22-Dec-14 1:09am

Simply Set requiredfield Validation in those Text Box

sasanka sekhar panda 22-Dec-14 4:34am

There is no requiredfield validator for windows application . This is not gridview ,this is dataGridView

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Maciej Los · Answer 1 · 2014-12-22T07:06:00

Here is a complete solution: How to: Validate Data in the Windows Forms DataGridView Control[^]

C#

private void dataGridView1_CellValidating(object sender,
    DataGridViewCellValidatingEventArgs e)
{
    // Validate the CompanyName entry by disallowing empty strings.
    if (dataGridView1.Columns[e.ColumnIndex].Name == "CompanyName")
    {
        if (String.IsNullOrEmpty(e.FormattedValue.ToString()))
        {
            dataGridView1.Rows[e.RowIndex].ErrorText =
                "Company Name must not be empty";
            e.Cancel = true;
        }
    }
}