How to change datagridview colors based on value contained within cells

Question

Hi all I would like to change cell index based on certain value like shown below ,I have seen many articles in here, but in ASP.NET this is a windows app how can I archive this thanks with a windows desktop app. Please Note the column that I want indexes changed is created dynamically.Thanks Dynamic column code creation

private void button3_Click(object sender, EventArgs e)
        {
              DataTable table = new DataTable();
                adap.Fill(table);
                dataGridView1.DataSource = table;
       table.Columns.Add("RESULTS").Expression = "Iif(((ActualWeight >= (.96 * TargetWeight)) And (ActualWeight <= (1.04 * TargetWeight))),'GOOD''BAD'))

 foreach (DataGridViewRow row in dataGridView1.Rows)
            {
                if (row.Cells[7].Value.ToString() == "BAD")
                    row.Cells[7].Style.ForeColor = Color.Red;
                //row.Cells["RESULTS"].Style.ForeColor = Color.Red;
            }

}

Answer 1

As you are adding a new column to the datatable table , you need to bind the table to the datagridview (refer this : how to bind datatable to datagridview in c# ) and then try to change the color.

Try this

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
    dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.ForeColor = Color.Red; //change the color to what you need
} 

UPDATE : To iterate through the DataGridView and check for cell contents in a specific column, you need something like

foreach(DataGridViewRow row in dataGridView1.Rows)
{
    if (row.Cells[7].Value.ToString() == "BAD")
        row.Cells[7].Style.ForeColor = Color.Red;
        //row.Cells["RESULTS"].Style.ForeColor = Color.Red;
}

You need to place this piece of code inside an event that is triggered or function that is called after the DataGridView is populated with data.

Answer 2

Here is some sample code demonstrating the desired result

ASPX:

<asp:GridView ID="GridView1" runat="server" OnRowDataBound="GridView1_RowDataBound" AutoGenerateColumns="true">
</asp:GridView>

Code behind:

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                ArrayList al = new ArrayList();
                al.Add("open"); al.Add("close"); al.Add("other"); al.Add("open"); al.Add("other"); al.Add("close"); al.Add("open");
                this.GridView1.DataSource = al;
                this.GridView1.DataBind();
            }
        }

            protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                if (e.Row.Cells[0].Text == "open")
                {
                    e.Row.Cells[0].ForeColor = System.Drawing.Color.Red;
                }
                else if (e.Row.Cells[0].Text == "close")
                {
                    e.Row.Cells[0].ForeColor = System.Drawing.Color.Black;
                }
                else
                {
                    e.Row.Cells[0].ForeColor = System.Drawing.Color.Green;
                }
            }
        }