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I am trying to use button event instead of dataGridView CellValidating event with the following codes. But They are giving some errors.

private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
       {
           DataGridViewComboBoxColumn comboBoxColumn = dataGridView1.Columns["kbaskani"] as DataGridViewComboBoxColumn;

           if (comboBoxColumn != null && e.ColumnIndex == comboBoxColumn.Index)
           {
               string newValue = e.FormattedValue.ToString();
               string oldValue = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();

               // Validate the selected value
               if (newValue == "Evet")
               {
                   // Check if another "Yes" option already exists in the column
                   int yesCount = 0;
                   foreach (DataGridViewRow row in dataGridView1.Rows)
                   {
                       if (row.Index != e.RowIndex && row.Cells[e.ColumnIndex].Value.ToString() == "Evet")
                       {
                           yesCount++;
                           break;
                       }
                   }

                   if (yesCount > 0)
                   {
                       MessageBox.Show("You have chosen more than one Yes option. You can choose only one Yes option.", "Validation Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                       e.Cancel = true; // Cancel cell validation
                       return;
                   }
               }
               else if (newValue == "Hayır")
               {
                   // Check if no "Yes" option is chosen
                   int yesCount = 0;
                   foreach (DataGridViewRow row in dataGridView1.Rows)
                   {
                       if (row.Index != e.RowIndex && row.Cells[e.ColumnIndex].Value.ToString() == "Evet")
                       {
                           yesCount++;
                           break;
                       }
                   }

                   if (yesCount == 0)
                   {
                       MessageBox.Show("You haven’t chosen any Yes option. You have to choose one of the Yes options.", "Validation Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                       e.Cancel = true; // Cancel cell validation
                       return;
                   }
               }
           }
       }


What I have tried:

How can we assign the following codes into the bottom event?
Posted
Updated 28-Jul-23 4:53am

You can't, not directly: that event takes a DataGridViewCellValidatingEventArgs parameter, while a Button Click event handler on gets a standard System.EventArgs which doesn't contain the info you are processing.
 
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Comments
Member 12505620 27-Jul-23 16:17pm    
Is there another way of to validate the combobox selection when I click the button?
The thing I want to do:

1-) If one of “Yes” options is not chosen, I want it to give this warning “You haven’t chosen one any Yes option. You have to choose one of the Yes options.”
2-) If someone chooses more than one Yes option, I want it to give this message “You have chosen more than one Yes option. You can choose only one Yes option.”
You can add the code to a button event and then loop through each row to do your validation for 'Yes'. I have adapted the code a little where if multiple 'Yes' options were selected, it deselects the other options and keeps only one 'Yes' option selected. -
C#
private void btnValidate_Click(object sender, EventArgs e)
{
    DataGridViewComboBoxColumn comboBoxColumn = dataGridView1.Columns["kbaskani"] as DataGridViewComboBoxColumn;

    if (comboBoxColumn != null)
    {
        int yesCount = 0;
        int rowIndexWithMultipleYes = -1;

        //Count the number of 'Yes' options and store the index if multiple 'Yes' options are chosen...
        for (int rowIndex = 0; rowIndex < dataGridView1.Rows.Count; rowIndex++)
        {
            DataGridViewRow row = dataGridView1.Rows[rowIndex];
            string cellValue = row.Cells[comboBoxColumn.Index].Value?.ToString();

            if (cellValue == "Evet")
            {
                yesCount++;

                if (yesCount > 1)
                {
                    rowIndexWithMultipleYes = rowIndex;
                    break;
                }
            }
        }

        //Display your message based on the count of 'Yes' options...
        if (yesCount == 0)
        {
            MessageBox.Show("You haven’t chosen any Yes option. You have to choose one of the Yes options.", "Validation Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        else if (yesCount > 1)
        {
            MessageBox.Show("You have chosen more than one Yes option. You can choose only one Yes option.", "Validation Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        else if (rowIndexWithMultipleYes != -1)
        {
            //If you find more than one 'Yes' option, but exactly one was chosen, deselect the other one/s...
            for (int rowIndex = 0; rowIndex < dataGridView1.Rows.Count; rowIndex++)
            {
                if (rowIndex != rowIndexWithMultipleYes)
                {
                    dataGridView1.Rows[rowIndex].Cells[comboBoxColumn.Index].Value = "Hayır";
                }
            }
        }
    }
}
 
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Comments
Member 12505620 28-Jul-23 12:51pm    
Thanks a lot for your interest Andre Oosthuizen. It works perfectly.
Andre Oosthuizen 28-Jul-23 14:39pm    
You're welcome.

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