Question

I’m working on a database in C# when I hit the display button I get an error:

Error:
Cannot bind to the property or column LastName on the DataSource.
Parameter name: dataMember

Code:

private void Display_Click(object sender, EventArgs e)
{
    Program.da2.SelectCommand = new SqlCommand("Select * From Customer", Program.cs);
    Program.ds2.Clear();
    Program.da2.Fill(Program.ds2);
    customerDG.DataSource = Program.ds2.Tables[0];

    Program.tblNamesBS2.DataSource = Program.ds.Tables[0];

    customerfirstname.DataBindings.Add(new Binding("Text", Program.tblNamesBS2, "FirstName"));
    customerlastname.DataBindings.Add(new Binding("Text", Program.tblNamesBS2, "LastName")); //Line Error occurs on.
}

Not sure what it means can anyone help, if I comment out the last two lines it will display properly.

Answer 1

it means your datatable is not finding column name LastName which is in your database..

in your case you filling your dataset with ds2..

 Program.da2.Fill(Program.ds2); 

and then you are binding your datasource to ‘program’ like this..

Program.tblNamesBS2.DataSource = Program.ds.Tables[0];  

it should like this..

Program.tblNamesBS2.DataSource = Program.ds2.Tables[0];  

because below line you are looking value from Program.tblNamesBS2 which is binded to ‘ds’
and that’s why column are not ther in ‘ds’.

 customerfirstname.DataBindings.Add(new Binding("Text", Program.tblNamesBS2, "FirstName"));    
  customerlastname.DataBindings.Add(new Binding("Text", Program.tblNamesBS2, "LastName"));