String or binary data would be truncated.?

Question

I'm building an input form in a C# web app. I can submit it just fine but I get the System.Data.SqlClient.SqlException (0x80131904): String or binary data would be truncated error. I know its a length issue but Ive double checked everything but just cant seem to figure this out here.

{
    // Open Connection
    thisConnection.Open();

    // Create INSERT statement with named parameters
    nonqueryCommand.CommandText = "INSERT  INTO InventoryInput (Date, Item, Qty, WStatus) VALUES (@Date, @Qty, @Item, @WStatus)";


    // Add Parameters to Command Parameters collection
    nonqueryCommand.Parameters.Add("@Date", System.Data.SqlDbType.DateTime);
    nonqueryCommand.Parameters.Add("@Item", System.Data.SqlDbType.VarChar, 255);
    nonqueryCommand.Parameters.Add("@QTY", System.Data.SqlDbType.NChar, 10);
    nonqueryCommand.Parameters.Add("@WStatus", System.Data.SqlDbType.VarChar, 50);


    nonqueryCommand.Parameters["@Date"].Value = TextBox1.Text;
    nonqueryCommand.Parameters["@Item"].Value = DropDownList1.Text;
    nonqueryCommand.Parameters["@QTY"].Value = TextBox2.Text;
    nonqueryCommand.Parameters["@WStatus"].Value = DropDownList3.Text;
    nonqueryCommand.ExecuteNonQuery();

}

Answer 1

You've mixed up two of your columns:

(Date,  Item, Qty,   WStatus) VALUES
(@Date, @Qty, @Item, @WStatus)

You're trying to insert your @Qty into the Item column (okay), and @Item into the Qty column (probably wrong).

I also agree with comments that some of the data types still look suspect - Eg a non-numeric quantity.

Answer 2

Make sure your inputs aren't too long with Substring() :

nonqueryCommand.Parameters["@Date"].Value = TextBox1.Text;
nonqueryCommand.Parameters["@Item"].Value = DropDownList1.Text.Substring(0, 255);
nonqueryCommand.Parameters["@QTY"].Value = TextBox2.Text.Substring(0, 10);
nonqueryCommand.Parameters["@WStatus"].Value = DropDownList3.Text.Substring(0, 50);