I just want to ask how I can update or change the cell value of column 'quantity' in my DataGridView when I select a certain row. I have 3 columns in my DataGridView which are Item Name, Quantity and Price. Every time I click the button 'add' or 'less' on my form, the quantity of the selected row item will either add to or subtract 1 from the quantity column and the price will also update every time the quantity increments or decrements. Here is my code when I add my item to my DataGridView.
I'm not really sure if I got it right to add items to my datagrid.
cmd = new MySqlCommand("SELECT * FROM tblmenu", dbConn);
MySqlDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
Button btn = new Button();
btn.Text = rdr["menuName"].ToString();
btn.Width = 126;
btn.Height = 80;
btn.Click += delegate
{
MySqlConnection cnn2 = new MySqlConnection(sqlConn.connString);
cnn2.Open();
cmd = new MySqlCommand("SELECT menuName, menuPrice FROM tblmenu WHERE menuName = @name", cnn2);
cmd.Parameters.AddWithValue("@name", btn.Text);
MySqlDataReader rdr2 = cmd.ExecuteReader();
while (rdr2.Read())
{
dataGridView1.Rows.Add(rdr2.GetString("menuName").ToUpper(), 1, rdr2.GetDouble("menuPrice"));
}
dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
lblQty.Text = dataGridView1.RowCount.ToString();
};
}
I have tried this but when I click another set of item, the quantity from the previous selected item still increments.
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
Add.Click += delegate
{
dataGridView1.Rows[e.RowIndex].Cells["quantity"].Value = Convert.ToInt32(dataGridView1.Rows[e.RowIndex].Cells["quantity"].Value) + 1;
};
Minus.Click += delegate
{
dataGridView1.Rows[e.RowIndex].Cells["quantity"].Value = Convert.ToInt32(dataGridView1.Rows[e.RowIndex].Cells["quantity"].Value) - 1;
};
}
First of all, using dataGridView1_CellContentClick does not serve the purpose at all. You intend to increase or decrease quantity on Add or Minus button click. I would use dataGridView1.CurrentRow property to get hold of CurrentRow and manipulate quantity column.For updating price column, you should have a Rate column or a constant Rate value to multiply it with quantity. Do you have it? If not then I don't see how you arrive on price calculation. However assuming you have one :
void quantity_change(object sender, EventArgs e){
var row=dataGridView1.CurrentRow;
if(row==null || row.Index<0)
return;
var unit = (sender==add)?1:-1;
var quantity = Convert.ToInt32(row.Cells["quantity"].Value) + unit;
row.Cells["quantity"].Value = quantity;
//assuming you have rate column...
var rate = Convert.ToDouble(row.Cells["Rate"].Value);
row.Cells["Price"].Value = quantity * rate;
}
Now bind Click event of your Add & Minus Buttons to the method above in Form constructor.
public myForm(){
InitializeComponents();
Add.Click+=quantity_change;
Minus.Click+=quantity_change;
}
You can also use form's Load event if you want.
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