Getting a primary key from a datagrid. C#

Right now I have a program where a user needs to highlight a row and click a button.   The function of that button depends on the row selection.   Is there a way to sync the CurrentRowIndex with a cell in that row like the primary key cell for example, or is there a completely different way to do this?  I'm open to suggestions!
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IceColdasConnect With a Mentor Commented:
ok, lets say you have this command string : commandString = "SELECT primaryKey, column2, column3, column4 FROM table1"
In this case, the primary Key column will be on the first position (means position 0).
else, if commandString = "SELECT column1, column2, primaryKey,  column4 FROM table1" (in this case, PKcolumn = 2)
Therefor, the program will be :

int PKcolumn = 0; //first position is 0, second position = 1, and so on
int rowIndex = dataGrid1.CurrentRowIndex;
//now, depending on the type of primaryKey field, either
int primaryKeyValue = (int)dataGrid1[rowIndex][PKcolumn];
string primaryKeyValue = dataGrid1[rowIndex][PKcolumn].ToString();
CurrentRowIndex tells you a position in your dataset, which is connected with grid.
m_Grid.DataSource - which is typically DataSet or DataTable - .DataSet.Tables(0).Rows(m_Grid.DataSource.CurrentRowIndex)
where m_Grid is your grid.
supose you know the position of the primary key column

int rowIndex = dataGrid1.CurrentRowIndex;
dataGrid1[rowIndex][PKcolumn]  will return the value of the desired column, from the current row;
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sean-keysAuthor Commented:

      It sounds like you hit the nail on the head, is there anyway you can give a brief example with a little more detail.  Please forgive my ignorance, sorry for the delay.

second, you can find any column position from the datagrid tablestyles, if you know the name of that column;
this way, if the column position change in the database, then your program will still work
i.e. :
private int GetColumnPosition(string myColumnName)
//myColumnName the name of the column you want to get the position
int columnPosition = -1;
int i=0;
/* either use TableStyles[0] if you have only one table in the dataset, or TableStyles[tableName] to specify the table name */
foreach (System.Windows.Forms.DataGridColumnStyle cs in dataGrid1.TableStyles[0].GridColumnStyles)
      /*for case insensitive comparision:
                                                 if  (cs.MappingName.ToUpper() == myColumnName.ToUpper() ) */
                if (cs.MappingName == myColumnName)
                 { columnPosition = i; break; }
return columnPosition;
sean-keysAuthor Commented:
I get the following errors when I build the code.   Maybe someone can shed some light on what I over looked.  Thanks

private void test_Click(object sender, System.EventArgs e)
                  int PKcolumn= 0;
                  int rowIndex = grdcustomers.CurrentRowIndex;
                  int primaryKeyValue= (int) grdcustomers[rowIndex][PKcolumn];
                  testval.Text =primaryKeyValue.ToString() ;

(1606): The best overloaded method match for 'System.Windows.Forms.DataGrid.this[System.Windows.Forms.DataGridCell]' has some invalid arguments
(1606): Argument '1': cannot convert from 'int' to 'System.Windows.Forms.DataGridCell'

sorry, my mistake
it is
 int primaryKeyValue= (int) grdcustomers[rowIndex, PKcolumn];
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