Show message in empty cells in GridView

Question

I'm importing GridView from excel I need to show a message near every empty cell to give the user information about what it should be writing..

void simpleButton1_Click(object sender, System.EventArgs e)
{
    string[] msg = new string[60];
    string[] error = new string[400];
    for (int i = 0; i < gridView3.RowCount ; i++)
    {
        System.Data.DataRow Rows = gridView3.GetDataRow(i);
        string cellvalue = Rows[0].ToString();
        if (cellvalue == "")
        {
            msg[0] = "Missing 'First Name'";
            error[i] = msg[0] + " - ";  
        }   
        cellvalue = Rows[1].ToString();
        if (cellvalue == "")
        {
            msg[1] = "Missing 'Last Name'";
            error[i] += msg[1] + " - ";
        }
        //...
    }
}

How can I put the variable msg[] to the specific cell with a little image or "!" figure or maybe I can color the cell

Answer 1

To change the color of cell

Rows[1].Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Red);

Answer 2

You can color the XtraGrid cells using Conditional Formatting feature:

gridControl1.DataSource = new List<Person> { 
    new Person(){ Name = "John", Age = 25 },
    new Person(){ Name = "Mary", Age = 17 },
    new Person(){ Age = 17  },
    new Person(){ Name = "Ann" },
    new Person(){ Name = "Pit", Age = 5 },
};
StyleFormatCondition nameCondition = new StyleFormatCondition();
nameCondition.Column = gridView1.Columns["Name"];
nameCondition.Condition = FormatConditionEnum.Expression;
nameCondition.Expression = "IsNullOrEmpty([Name])";
nameCondition.Appearance.BackColor = Color.Red;
nameCondition.Appearance.Options.UseBackColor = true;

StyleFormatCondition ageCondition = new StyleFormatCondition();
ageCondition.Column = gridView1.Columns["Age"];
ageCondition.Condition = FormatConditionEnum.Expression;
ageCondition.Expression = "[Age]<10";
ageCondition.Appearance.BackColor = Color.Maroon;
ageCondition.Appearance.Options.UseBackColor = true;

gridView1.FormatConditions.AddRange(new StyleFormatCondition[] { 
    nameCondition, ageCondition
});

Result:

Related Links:
Customizing Appearances of Individual Rows and Cells
Style Format Conditions
Custom Painting (Samples)