ผมกำลังทำการแก้ไขข้อมูลอยู่ครับแต่ขึ้น Error ขึ้นว่า " Incorrect Syntax near = '12'.

private void tsb_EditDis_Click(object sender, EventArgs e)
        {
            ConnectionStringSettings conSettings = ConfigurationManager.ConnectionStrings["ApplicationDatabase"];
            string ConnectionStrings = conSettings.ConnectionString;
            
            try
            {

                conn = new SqlConnection(ConnectionStrings);
                conn.Open();
                cmd = new SqlCommand("UPDATE CommiteeReq SET "+
                 "DocDT =" + txt_DocDate.Text + 
                 "ProjKey =" + txt_ProjKey.Text + 
                 "ProjCode =" + txt_ProjCode.Text + 
                 "ProjAlias =" + txt_ProjAlias.Text + 
                 "ProjName =" + txt_ProjName.Text + 
                 "ContractID =" + txt_ContractID.Text + 
                 "ContractDate =" + txt_ContractDate.Text + 
                 "CustomerKey =" + txt_CustomerKey.Text + 
                 "CustomerName =" + txt_CustomerName.Text + 
                 "ContractAmt =" + txt_ContractAmt.Text + 
                 "ContractVat =" + txt_ContractVat.Text + 
                 "ContractTax =" + txt_ContractTax.Text + 
                 "ContractTaxPercent =" + txt_ContractTaxPer.Text + 
                 "ReqNote =" + txt_ReqNote.Text + 
                 "ReqValue =" + txt_ReqVal.Text + 
                 "ReqValuePercent =" + txt_ReqValPer.Text + 
                 "NetReqValue =" + txt_NetReqVal.Text + 
                 "DiscNote =" + txt_DiscNote.Text + 
                 "DiscValue =" + txt_DiscValue.Text + 
                 "NetTotal =" + txt_NetTotal.Text + 
                 "Note =" + txt_Note.Text + 
                 "WHERE CommiteeReqKey =" + txt_CommitReqKey.Text, conn);
                int x = cmd.ExecuteNonQuery();
                if (x == 1)
                { 
                    MessageBox.Show("ปรับปรุงข้อมูลใช่หรือไม่","ยืนยันการแก้ไขข้อมูล",MessageBoxButtons.OK);
                }
                ClearForm();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                conn.Close();
            }
            Datagridview_DGV_Dis();
        }