How to make a column in datagridview editable

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C#

Dear all,

I have two columns in datagridview. The first column is bounded from the datatable and the second column is empty. The definition of the columns are like this:

DataGridViewTextBoxColumn textColumn = new DataGridViewTextBoxColumn();
textColumn.DataPropertyName = "column1";
textColumn.Name = "column1";
textColumn.ReadOnly = true;
dataGrid.Columns.Add(textColumn);

textColumn = new DataGridViewTextBoxColumn();
textColumn.Name = "column2";
dataGrid.Columns.Add(textColumn);

How can I make column2 always in edit mode?

Thanks in advance.