how I can show the sum of in a datagridview column in asp.net

Question

i have a datagridview which are used to display a transaction record. And one of the columns in datagridview is \"amount\"

girdview codeenter code here

Answer 1

try this...

 int sum = 0;
 for (int i = 0; i < dataGridView1.Rows.Count; ++i)
 {
     sum += Convert.ToInt32(dataGridView1.Rows[i].Cells[2].Value);
 }
GridViewRow row = GridView1.FooterRow; 
((Label)row.FindControl("lbltotal")).Text=sum.ToString();

Answer 2

use table.Compute function

   private void ComputeBySalesSalesID(DataSet dataSet)
{
    // Presumes a DataTable named "Orders" that has a column named "Total."
    DataTable table;
    table = dataSet.Tables["Orders"];

    // Declare an object variable. 
    object sumObject;
    sumObject = table.Compute("Sum(Total)", "EmpID = 5");

    //Find label
     GridViewRow footer = dgOpenBal.FooterRow;
     var lblTotal = (Label)footer.FindControl("lblTotal");
     lblTotal.Text = sumObject.ToString();
}

Another approach use stored procedure to get calculated amount from Sproc

private void ComputeBySalesSalesID(DataSet ds)
{
         if (ds.Tables[0].Rows.Count > 0)
                {
                    DataRow drSum = ds.Tables[0].Rows[0];
                    GridViewRow footer = dgOpenBal.FooterRow;
                    var lblTotal = (Label)footer.FindControl("lblTotal");
                    lblTotal.Text = drSum["sum"].ToString();
                }
}