I have tried the update query as discussed by code project colleagues but no result

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I have tried to update the query but it was unsuccessful I want Innerjoin statements
cmd = new OleDbCommand("UPDATE InvoiceItems set Description ='" + txtProductName + "',Quantity = '" + txtQty.Text + "',UOM = '" + txtUOM.Text + "',UnitPrice ='" + txtUnitPrice.Text + "',GrossAmount ='" + txtGrossAmount.Text + "',VAT = '" + txtVAT.Text + "',VatAmount ='" + txtVatAmount.Text + "',Total ='" + txtTotal.Text + "', from InvoiceItems,Products INNERJOIN InvoiceItems.ProductId = Products.ProductId where InvoiceNumber='" + txtInvoice.Text.Trim() + "'", conn);

What I have tried:

cmd = new OleDbCommand("UPDATE InvoiceItems set Description ='" + txtProductName + "',Quantity = '" + txtQty.Text + "',UOM = '" + txtUOM.Text + "',UnitPrice ='" + txtUnitPrice.Text + "',GrossAmount ='" + txtGrossAmount.Text + "',VAT = '" + txtVAT.Text + "',VatAmount ='" + txtVatAmount.Text + "',Total ='" + txtTotal.Text + "', from InvoiceItems,Products INNERJOIN InvoiceItems.ProductId = Products.ProductId where InvoiceNumber='" + txtInvoice.Text.Trim() + "'", conn);

Posted 13-Oct-16 22:49pm

Member 12790908

Updated 13-Oct-16 23:13pm

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OriginalGriff · Answer 1 · 2016-10-13T23:13:00

I'm pretty sure that the first thing they would have told you is: Don't do it like that. Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.
And have a look at the syntax of a JOIN clause: INNER JOIN tableName optionalTableAlias ON condition WHERE ... not INNERJOIN condition WHERE ...