CODE EXAMPLE FOR CSHARP

c# datagridview count value

var count = this.dataGridViewArticles.Rows.Cast<DataGridViewRow>().Count();
var countjustX = this.dataGridView1.Rows.Cast<DataGridViewRow>()
               .Count(row => row.Cells["RisFin"].Value == "X");

this.textBox1.Text = count.ToString();