Question

i am doing a project on window form in c#
i have a DataGridView with data from the database

now i want to do editing in data GridView, and i have this column call Name, but and i want to validate so that when user edit, it will only key in alphabet, like example, in the Name column row 1 has a name call Rosy Chin, then user edit to this Rosy Ch11n …it should prompt the user say that only alphabet, i use the code below but it don’t prompt me that message…however if the user edit to this 4Rosy Chin….it will appear the prompt message…can i know where am i wrong??

private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
    if (e.RowIndex >= 0 && e.ColumnIndex >= 0)
    {
        //int indicator;
        int newInteger;

        if (e.ColumnIndex == 1)
        {
            if (dataGridView1.Rows[e.RowIndex].IsNewRow) return;
            String data = e.FormattedValue.ToString();

             String validate= @"^[a-zA-Z]";
             Regex nameAlphabet = new Regex(validate);
             String nameGridView = data;                 
             if(!(nameAlphabet.IsMatch(nameGridView )))
             {
                 e.Cancel = true;
                 MessageBox.Show(@"Name must be in Alphabet!");
             }
             else
                 return;
        }
}

Answer 1

Try to fix your RegEx:

 ^[a-zA-Z ]+$

Description:

^ start of line
[a-zA-Z ] any letter or space
+ one or more
$ end of line

Good RegEx sandbox.

---

To not allow only s space:

^[A-Za-z][a-zA-Z ]+[A-Za-z]$

Link to the sandbox.