Getting ONE item out of a datatable?

[JLC]

I want to get one item out of a datatable, but when I click on the row I am getting an error that says: IndexOutOfRange Exception. There is now row at position x (whatever row I clicked)

Here's my code, I am very new to this...

What I want to do is get the clusterID from the datatable that was selected by the user and I want to pass that clusterID into a function.

Am I even on the right path??
Any help is appreciated!
Thanks

    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        GridView gv = (GridView)sender;
        Int32 rowIndex = Convert.ToInt32(e.CommandArgument.ToString());
 
        //find the cluster id using the rowIndex that was selected
        DataRow dr = clustersTable.Rows[rowIndex];
        DataColumn dc = (DataColumn)dr["clusterID"];
        int clusterID = Convert.ToInt32(dc);