Hi Marc,

After doing some research, I found that we could handle the ColumnChanging
event of the DataTable to truncate the proposed value, if necessary.

The ColumnChanging event occurs when a value is being changed for the
specified DataColumn in a DataRow, even if the DataRow has not been added
to the DataTable.

The following is a sample.

public Form2()
{
           InitializeComponent();
           this.dataSet11.TestTable.ColumnChanging += new
DataColumnChangeEventHandler(TestTable_ColumnChanging);
}
void TestTable_ColumnChanging(object sender, DataColumnChangeEventArgs e)
{
           if (e.Column.ColumnName == "columnname")
           {
               e.ProposedValue = ((string)e.ProposedValue).Substring(0,
maxlengthofcolumn);
           }
 }

Hope this helps.
If you have any question, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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