title: Why can't validate a column in DataGridView only alphabet?
body: <p>i am doing a project on window form in c# 
  i have a DataGridView with data from the database</p>
  
  <p>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??</p>
  
  <pre><code>private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
  {
      if (e.RowIndex &gt;= 0 &amp;&amp; e.ColumnIndex &gt;= 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;
          }
  }
  </code></pre>