update dataGridView in winform app

I have in my winform app a dataGridView and I displayed the data from the DAL class with dataSet like this

DataSet ds2 = DAL.Display_all()开发者_Python百科;
dataGridView1.DataSource = ds2;
dataGridView1.DataMember = "To_display";

How can I update Back my data if If someone change data in the gridView ( I need to sand back to the DAL class)?

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Use the DataAdapter.Update method.

Pass the DataSet as the parameter.

You can use DataSet.HasChanges to see if you have any changes before calling the Update method.

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try this :

dataGridView1.ResetBindings();

Causes a control bound to the BindingSource to reread all the items in the list and refresh their displayed values. MSDN

hope this help.

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If you loop through each row of the DataGridView you can use the below method to get the value of a specified Column on a specific row.

    private T GetDataGridViewTextBoxValue<T>(int rowIndex, string columnName)
    {
        try
        {
            return (T)Convert.ChangeType(dataGridViewImport.Rows[rowIndex].Cells[columnName].Value, typeof(T));
        }
        catch (Exception e)
        {
            throw new InvalidOperationException(String.Format("Row : {0}, column : {1} could not be cast to {2}", rowIndex, columnName, typeof(T)), e);
        }
    }

And you can use the method like this.

for(int i=0;i< ds2.Tables[0].Rows.Count(); i++)
{
    var column1 = GetDataGridViewTextBoxValue<string>(i, "column1");
    //Get the rest of the row values.
    //In your DAL class you must have a Method that updates the row 
    //and then just pass in the values that you want.
}