kvnsdr
asked on
C#: Value cannot be null, Parameter name 'dataset'
I keep recieving an error: when I click on my "Update" button. So, I'm guessing the DataSet (ds) in the "Click Event" method dosen't have any data in it. The datagrid Does fill via the Load Method though.....
Q. Can you see the problem????????
private void Form1_Load(object sender, System.EventArgs e)
{
try
{
string SQL = " SELECT col1, col2 FROM table1 ";
SqlConnection cn = new SqlConnection("integrated security=SSPI;data source=local; persist security info=False;initial catalog=master ");
SqlDataAdapter da = new SqlDataAdapter(SQL,cn);
DataSet ds = new DataSet();
da.Fill(ds, "table1");
dataGrid1.DataSource = ds;
dataGrid1.SetDataBinding(d
}
catch(Exception er)
{
MessageBox.Show(er.ToStrin
}
}
private void button1_Click(object sender, System.EventArgs e)
{
string SQL = " SELECT * FROM table1 ";
SqlConnection cn = new SqlConnection("integrated security=SSPI;data source=local; persist security info=False;initial catalog=master ");
SqlDataAdapter da = new SqlDataAdapter(SQL,cn);
da.Update(ds,"table1");
}
}
}
Q. Can you see the problem????????
private void Form1_Load(object sender, System.EventArgs e)
{
try
{
string SQL = " SELECT col1, col2 FROM table1 ";
SqlConnection cn = new SqlConnection("integrated security=SSPI;data source=local; persist security info=False;initial catalog=master ");
SqlDataAdapter da = new SqlDataAdapter(SQL,cn);
DataSet ds = new DataSet();
da.Fill(ds, "table1");
dataGrid1.DataSource = ds;
dataGrid1.SetDataBinding(d
}
catch(Exception er)
{
MessageBox.Show(er.ToStrin
}
}
private void button1_Click(object sender, System.EventArgs e)
{
string SQL = " SELECT * FROM table1 ";
SqlConnection cn = new SqlConnection("integrated security=SSPI;data source=local; persist security info=False;initial catalog=master ");
SqlDataAdapter da = new SqlDataAdapter(SQL,cn);
da.Update(ds,"table1");
}
}
}
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ASKER
Upon your advice to drop the DataSet to ds I was able to get much further. However I then recieved errors concerning inadequate 'update' statement . So upon further study of SQLCommandBuilder, here is the final working code..... Take note, this may help you some day as well. Also, I really appreciate all your help, thank you....
private void button1_Click(object sender, System.EventArgs e)
{
string SQL = " SELECT * FROM table1 ";
SqlConnection cn = new SqlConnection("integrated security=SSPI;data source=local; persist security info=False;initial catalog=master ");
SqlDataAdapter da = new SqlDataAdapter(SQL,cn);
SqlCommandBuilder cb = new SqlCommandBuilder(da);
da.Update(ds,"table1");
ds.AcceptChanges();
}
}
}
private void button1_Click(object sender, System.EventArgs e)
{
string SQL = " SELECT * FROM table1 ";
SqlConnection cn = new SqlConnection("integrated security=SSPI;data source=local; persist security info=False;initial catalog=master ");
SqlDataAdapter da = new SqlDataAdapter(SQL,cn);
SqlCommandBuilder cb = new SqlCommandBuilder(da);
da.Update(ds,"table1");
ds.AcceptChanges();
}
}
}
cn.Open();
da.Connection = cn;