Multiplication result automatic and to connecting the database

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hi,

i want to calculate 3 text box values to automatic result in textbox4, and also this values are inserted to the database.
Please help me urgent.........

What I have tried:

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{

foreach(DataGridViewRow row in dataGridView1.Rows)
{
row.Cells[dataGridView1.Columns["total"].Index].Value = (Convert.ToDouble(row.Cells[dataGridView1.Columns["length"].Index].Value) * Convert.ToDouble(row.Cells[dataGridView1.Columns["breadth"].Index].Value) * Convert.ToDouble(row.Cells[dataGridView1.Columns["height"].Index].Value));

}

}

Posted 8-Oct-18 20:59pm

Member 14012665

Updated 9-Oct-18 6:26am

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Patrice T 9-Oct-18 3:17am

What is the problem with this code ?

2 solutions

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OriginalGriff · Answer 1 · 2018-10-08T21:22:00

For starters, don't use Convert for any user input. Users make mistakes, so always validate it using TryParse:

C#

double length;
if (!double.TryParse(myTextBox.Text))
   {
   ... report problem to user ...
   return;
   }

Then pass the result of your multiplication to SQL via a parameterised query:

C#

using (SqlConnection con = new SqlConnection(strConnect))
    {
    con.Open();
    using (SqlCommand cmd = new SqlCommand("INSERT INTO myTable (myColumn1) VALUES (@C1)", con))
        {
        cmd.Parameters.AddWithValue("@C1", myValueForColumn1);
        cmd.ExecuteNonQuery();
        }
    }

kanangandhi · Answer 2 · 2018-10-09T06:26:00

C#

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
       {
           DataGridViewRow dvr = dataGridView1.Rows[e.RowIndex];
           if (dvr != null)
           {
               textBox1.Text = dvr.Cells["length"].Value.ToString();
               textBox2.Text = dvr.Cells["breadth"].Value.ToString();
               textBox3.Text = dvr.Cells["height"].Value.ToString();

               textBox4.Text = (Convert.ToInt32(textBox1.Text) + Convert.ToInt32(textBox2.Text) + Convert.ToInt32(textBox3.Text)).ToString();
           }
       }

Multiplication result automatic and to connecting the database

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