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copied!<p>If I understand your situation properly, you can achieve what you are looking for by handling the <code>DataGridView.CellValueChanged</code> event. This prevents you from having to loop through all your rows. In theory, this should work as you populate the DGV control. </p> <p>Here is a very crude example of what I am talking about. You will likely need to play with it to make it work for your specific situation. In my case, it adjusts the <code>Style.Backcolor</code> of a cell when a changed value is committed. Since there is the possibility that there will only be a single row when data is entered, I set up a conditional to handle this case as well. </p> <p>If this is the Winforms DGV control, you need to use the <code>Cell.Style.BackColor</code> Property, not the <code>Cell.BackColor</code> property (which doesn't exist on the Winforms DGV) in your code. </p> <p>You will have to refine the code to suit your circumstances . . . </p> <pre><code> private void Form1_Load(object sender, EventArgs e) { // Add a handler for the cell value changed event: this.myDataGridView.CellValueChanged += new DataGridViewCellEventHandler(myDataGridView_CellValueChanged); } void myDataGridView_CellValueChanged(object sender, DataGridViewCellEventArgs e) { // grab a reference to the changed cell: DataGridViewCell cell = myDataGridView.Rows[e.RowIndex].Cells["contract_id"]; // Guard against the case where this is the first row in the DGV table: if (cell.RowIndex - 1 >= 0) { if (cell.Value != myDataGridView.Rows[cell.RowIndex - 1].Cells["contract_id"].Value) { // CHange the Style.BackColor property for the cell: myDataGridView.CurrentRow.Cells["contract_id"].Style.BackColor = Color.Blue; } } </code></pre>

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