converting to double to two decimal places

Question

Hi i am a c# novice would someone politely tell me how to convert the values of this piece of code to a double/rounded decimal.. thanks in advance

DataTable dtValues = new DataTable("GetValues");

strValueNumber = ValueNumber[0].ToString();
dtGetValues = SQLMethods.GetValues(strValueNumber);

total = 0;

for (int i = 0; i < dtValues.Rows.Count; i++)
{
    total1 = total1 + Convert.ToInt32(dtGetValues.Rows[i]["total_1"]);                  
    total2 = total2 + Convert.ToDouble(dtGetValues.Rows[i]["total_2l"]) * .45; 

    tbtotal1.Text = total1.ToString();
    tbtotal2.Text = total2.ToString(); 
}
}               
catch (Exception ex)
{
    MessageBox.Show("Error in returning selected Values. " +
                    "Processed with error:" + ex.Message);
}
}

Answer 1

My answer is pretty late but for those out there like me who want:

to convert to double/decimal and also want the value to always show 2 decimal places (.00) as String

tbtotal2.Text = Math.Round(total2, 2).ToString("#.00"); 

The below means two decimal places at all times.

"#.00"

The below means two decimal places if there is value.

"#.##"