Validations inside DataGridView TextboxColumn

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C#3.0

C#

WinForms

Hi
i want to perform validations on DatagridviewTextboxColumn
suppose if i have 5 Textboxes inside DataGridView1->Column1,
i want to accept only 2 decimal places on each textbox,
and also
1st Textbox Value < 2nd Textbox Value
2nd Textbox Value < 3rd Textbox Value
3rd Textbox Value < 4th Textbox Value
4th Textbox Value < 5th Textbox Value

I want some help to acheive my task..
Any idea plz let me know.

The below is my Code

DataTable dtGridEdit = new DataTable();
DataRow dr = null;
DataGridViewTextBoxColumn TxtCol = new DataGridViewTextBoxColumn();
private void FillGridView()
{
        for (int i = 0; i < 4; i++)
        {
                dr = dtGridEdit.NewRow();
                dtGridEdit.Rows.Add(dr);
        }
        dgridEdit.DataSource = dtGridEdit;
        dgridEdit.Columns.Add(TxtCol);
}

 private void dgridEdit_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            try
            {
                if (e.Control.GetType().BaseType.Name == "TextBox")
                    mobjInnerTextBox = (TextBox)e.Control;
                 mobjInnerTextBox.KeyPress += new KeyPressEventHandler(mobjInnerTextBox_KeyPress);
            }
            catch (Exception ex)
            {
                DataClass.LogError(ex);
            }
        }
 bool DotEntered;
        private void mobjInnerTextBox_KeyPress(object sender, KeyPressEventArgs e)
        {
            try
            {
                if (mobjInnerTextBox.Text == "")
                {
                    DotEntered = false;
                }
                if (e.KeyChar == '.' && DotEntered == false)
                {
                    e.Handled = false;
                    DotEntered = true;
                }
                else if (char.IsDigit(e.KeyChar) == true || e.KeyChar == (char)Keys.Back)
                {
                    e.Handled = false;
                }
                else
                {
                    e.Handled = true;
                }
            }
            catch (Exception ex)
            {
                DataClass.LogError(ex);
            }
        }

Regards,
Pawan.